Preserved, you say?
The New Testament is "preserved"????
Bro, that has to be the most ridiculous statement I've read all week on this forum, and I've read quite a few.
Seems your dissemination of Qur'an is faulty - but what can I expect from a Christian who interprets any holy scripture according to his bias? Let's put you straight in sha Allah.
The Qur'an does indeed.
Up til the time of... meaning, when God revealed the Qur'an to Muhammad pbuh, it was time for a new revelation because the old one was confuddled with so many versions and so many sects that the core theology of the Christians was too far gone to revert back to the original path.
The Qur'an teaches that the Torah, Psalms and Injeed were vaildated scriptures, until their corruptions. As for the injeel where is it? I don't see the Gospel of Jesus pbuh anywhere, I see gospels according to four men who never left a last name and are mysterious figures whom the church is still guessing at. So please - do not attempt to paint the various new testaments as the gospel of Jesus pbuh. They are not.
Allah sent down the Torah, and the Gospel, the verse says - not Jesus. It was given to Jesus, and only some men knew that gospel, who then ran for their lives during the passion and crucifxion mess - and practiced their faith in secret... meanwhile, the book you hold is Pauline doctrine, and Paul didn't even know Jesus, so please - remind yourself to not make such hairy mistakes again.
WOW - massive errors on your part lol.
5:43 is describing an incident when the Jews wanted the Prophet Muhammad pbuh to judge their criminals crime according to shariah - but Muhammad pbuh told them to judge according to their own laws, and so the criminal was stoned to death - the Jews were expecting a lighter form of punishment due to them expecting shariah law to be effective for the Jews, but NOOOOOO, Prophet Muhammad pbuh told the Jews, judge him according to your own laws... a lot of Jews regretted being Jewish that day... wanna guess what happened next?
As for 21:48 - another grave error by you, boy oh boy, your ayah references do you no favours bro trust me.
I'm showing you how you are doing this wrong.
21:48 - Just confirms that Moses and Aaron pbut were given the Law - and for the record, Torah, means LAW. As we already established. But that LAW was abrogated by the Jewish rabbi's interpreting the meanings and punishments wrongly... small wonder now, why the Jews of Medina wanted to be judged for their crimes according to the Shariah and not the Torah. Savvy?
Goodwill, you've made many mistakes here - massive ones.
You're burying yourself now bro - here is the ayah:
Say, "O People of the Scripture, you are [standing] on nothing until you uphold [the law of] the Torah, the Gospel, and what has been revealed to you from your Lord." And that which has been revealed to you from your Lord will surely increase many of them in transgression and disbelief. So do not grieve over the disbelieving people.
As I mentioned, the Christians and the Jews were to follow the LAW of the TORAH properly - which is why the ayah specifically mentions "...you are standing on NOTHING UNTIL YOU UPHOLD THE LAW OF THE TORAH..." which they could never uphold, even Jesus pbuh told the Rabbi's they had corrupted the Laws an made the temple a den of thieves. You're so out of context Goodwill, honestly.
The Jews of Medina preferred shariah law over their own corrupted explanations of the Mosaic Law of Torah - the Talmud. And the Talmud - being a man made work and not divine - is compared to the Islamic ahadeeth because the Talmud contains the narrations regarding the practice of the Laws, but, they were totally corrupted by the "lying pen of the scribes" go see Jeremiah 8.
Referring to the Qur'an - because this sure doesn't appeal to any other scripture.
The Torah, disappeared during the captivity in Babylon - it came back because Ezra pbuh recited it for the children of Israel after he was raised back to life again - he'd been dead for 100 years and during those 100 years, the 70 year captivity happened and the Torah was destroyed.
When Ezra was raised back to life, he entered Jerusalem and that's when he eventually taught the Torah to the children of Israel - who did not have a Rabbi amongst them by the way. They changed the "meanings" and this eventually led to all sorts of corruption in Judaism, one of which, is recorded in your bible, namely the event when Jesus pbuh became really angry at the temple because the Rabbi's had turned the temple into a den of thieves.
Nope. It shows that elements of it remained uncorrupted - that is all. When it comes to the most important message - theology - the bible is all over the place. Because, it's not divine - it is not the gospel of Jesus pbuh, but as I mentioned - the gospel of four mysterious figures the church fathers and scholars still remain confused over.
I think it's ridiculous, if I were to read a text book on science written by a man who never left his last name, I would not trust it because the author himself did not see it fit to lend his identity to his work.
The Torah doesn't suffer this, but the New Testament does.
WOW - you are sooo out of context, I'm starting to think you are trolling lol
Read the chapter from verse 88 to 94 and try and claim what you did again
You will not be able to.
Allah informed Muhammad pbuh about the Egyptian captivity Moses pbuh freeing the children of Israel - this event - and this is what Allah is asking the Prophet Muhammad pbuh to have confirmed by the children of Israel - The Children of Israel - Jews, not Christians, and the confirmation was regarding an historical event. The red sea crossing. Pull ya socks up fella.
16:43 -
And We sent not before you except men to whom We revealed [Our message]. So ask the people of the message if you do not know.
Muhammad, who had no idea what he was being tasked with as the first Prophet and Messenger to the Arabs with no prior knowledge of the previous prophets and messengers - was now being told by Allah, that HE had indeed sent prophets and messengers to the nations before his own, and if he did not know this, then to seek their truths by asking the children of Israel about these prophets and messengers.
This in no way lends your claim any strength, but serves to only strengthen the claim of Islam even more. That Muhammad pbuh is the final prophet and messenger to all mankind. This is contextual, and not open to interpretation - a bad habit Christians have run with since, well, Constantine.
First - define dominant

because your yard stick by which you measure - is "material"... which is why you fail in your interpretation, and the Qur'an does not require "interpretations" - it is perfectly contextual and understood by Muslims around the world, who find what you just write, ridiculous - the whole post of yours - ridiculous.
Now, for the ayaat themelves.
61:14 - O ye who believe! Be ye helpers of Allah. As said Jesus the son of Mary to the Disciples, "Who will be my helpers to (the work of) Allah." Said the disciples, "We are Allah.s helpers!" then a portion of the Children of Israel believed, and a portion disbelieved: But We gave power to those who believed, against their enemies, and they became the ones that prevailed.
PREVAILED - in what? worldly matters? or in their afterlife because they believed in the correct belief? The latter, obviously. Come on brooo, don't read bias into scripture - that is wrong and unhealthy for your soul because you are guiding it wrongly and into the narratives of those who passed before you and are taking their seat in the fire for being such liars to their own souls and to others whom are impressionable and easily led.
3:55 - when Allah said, "O Jesus, indeed I will take you and raise you to Myself and purify you from those who disbelieve and make those who follow you [in submission to Allah alone] superior to those who disbelieve until the Day of Resurrection. Then to Me is your return, and I will judge between you concerning that in which you used to differ.
This is really not helping your case now is it?
1) Allah raised Jesus pbuh to HIMSELF. No Cruci-fiction.
2) Allah is informing Muhammad pbuh about when the followers of Jesus pbuh, who were more contextually - better Jews than the Jews themselves - had been raised in rank for believing in the correct theology and dissemination of the Mosaic Laws, as being "purified" in belief and conduct. Nothing more, nothing less.
3) and that on the day of judgement, Allah will judge between what they used to differ.
4) This does not help your point. As it actually lays a foreboding trial over those who differed with the Muslims with a hard hearted bias and mockery.
29:46 - And do not argue with the People of the Scripture except in a way that is best, except for those who commit injustice among them, and say, "We believe in that which has been revealed to us and revealed to you. And our God and your God is one; and we are Muslims [in submission] to Him."
And do not argue with the People of the Scripture except in a way that is best - meaning, with respect and due dilligence, and without emotional attachment, appealing to their better senses such as reason, logic, context and cotext of biblical verses and quranic ayaat, etc
except for those who commit injustice among them, - these we do not entertain. They are not worth wasting time over - we Muslims are a people of deed and conduct, we do not entertain such idiotic situations. We leave those fools to themselves, unless they seek truth. In which case we discuss in a manner which is mutually sound and engaging. But if they persist in their mockery and bias, we say: "We believe in that which has been revealed to us and revealed to you. And our God and your God is one; and we are Muslims [in submission] to Him."
You wasted your time attempting to interpret the Qur'an yourself when the Qur'an requires no interpretation but contextual study. We do not suffer the corruptions your scripture did. We are not on shaky ground.
Your hubris is cute, though 
Next time, come with something more substantial than this wasteful exercise you thought had momentum in it.
God bless,
Scimi