Assalamu alaikum wa rahmatullahi wa barakatuhu to those who follow the Straight Path
Let me make this crystal clear so there is no doubt remaining in anyone's mind...MUSLIMS, and only MUSLIMS are going to Heaven, everyone else is going to Hell, and Allah Taala Knows Best
By definition, every MUMIN (believer) must be a MUSLIM, there is no such thing as a believing Christian or a believing anything else. By definition, Christians and all other non-Muslims are disbelievers, they do not have an iota of Faith and therefore are not deserving of salvation.
If any do deeds of righteousness,- be they male or female - and have faith, they will enter Heaven, and not the least injustice will be done to them. (4:124)
tomtomsmom has missed out the crucial part "and have faith" (wahuwa muminun), and therefore he/she has misinterpreted and misunderstood the verse. This is why I strongly encourage Christians and other non-Muslims that when they read the Holy Quran read it as a whole and do not come posting selective verses with limited understanding in a futile attept to teach us the beliefs of our own Religion. The first book most Muslims ever read in their life is the Holy Quran, we learn to read, memorize, and recite the Holy Quran from a very, very young age, and we re-read it constantly throughout our lives. I think than that we should have more credibility than the non-Muslims in interpreting and explaining our own Holy Book.
1. What is the evidence from Holy Quran that the true religion is Islam?
The Religion before Allah is Islam (submission to His Will): Nor did the People of the Book dissent therefrom except through envy of each other, after knowledge had come to them. But if any deny the Signs of Allah, Allah is swift in calling to account. (3:19)
2. What is the evidence from Holy Quran that true Faith (Iman) is only possible in Islam?
Abraham was not a Jew nor yet a Christian; but he was true in Faith, and bowed his will to Allah's (Which is Islam), and he joined not gods with Allah. (3:67)
3. What is the evidence that apostasy from Islam is unbelief (kufr)?
Nor would he instruct you to take angels and prophets for Lords and patrons. What! would he bid you to unbelief after ye have bowed your will (To Allah in Islam)? (3:80)
4. What is the evidence that all the creation of the Heavens and Earth follow Islam, and that man should do likewise?
Do they seek for other than the Religion of Allah.-while all creatures in the heavens and on earth have, willing or unwilling, bowed to His Will (Accepted Islam), and to Him shall they all be brought back (3:83)
5. What is the evidence that any other religions except Islam is rejected by Allah and any non-Muslim will be doomed in the Hereafter?
If anyone desires a religion other than Islam (submission to Allah., never will it be accepted of him; and in the Hereafter He will be in the ranks of those who have lost (All spiritual good). (3:85)
I hope this helps, Jazak Allah Khair.
O ye who believe! Fear Allah as He should be feared, and die not except in a state of Islam. (3:102)