well i had assumed that you knew little of the old testament, but i certainly didn't think that your understanding would be so bad. in your above post you claim that the old testament does not show the one god of israel to be xistent as more than one person and that is patently false:
Zech. 2:10-11 — “Shout and be glad, O Daughter of Zion. For I am coming, and I will live among you,” declares the LORD. 11“Many nations will be joined with the LORD in that day and will become my people. I will live among you and you will know that the LORD Almighty has sent me to you.
notice what is said in the above, the god of israel says that he will live among the jews (zion is another name for jerusalem which can signify israel in general) and in fact many other nations will be joined with him and will become his people. yet surprisingly, we will know that the god of israel has sent him to us. the speaker in the above is th god of israel and he says that he will be sent by the god of israel. at the very least two different individuals are spoken of here who both are the one LORD (when you see 'lord' in capitals it in fact stands for the ineffinable name of god) yet the god of israel will be sent to dwell with men by the god of israel. this is actually a prophecy of christ who is himself the god of israel and is sent to dwell with men by the god of israel.
Genesis 19:24 — Then the LORD rained down burning sulfur on Sodom and Gomorrah—from the LORD out of the heavens.
i encourage you to go back and read the relative context of what i have cited and will cite so that for one thing, you will see that i'm not taking these verses out of context, and furthermore, that you yourself can find out about the context. anyway, in the above, after meeting and speaking to abraham face to face, god goes down to sodom and gomorrah in order to destroy it but look at what the text says. the LORD at sodom and gomorrah causes fire to rain down from the LORD in heaven. notice once again that the one LORD, the one god of israel who throughout the entire bible says to be only one is existent as more than one person in his being.
Genesis 1:1-2 — In the beginning God created the heavens and the earth. 2 Now the earth was formless and empty, darkness was over the surface of the deep, and the Spirit of God was hovering over the waters.
1 Kings 18:12 — I don’t know where the Spirit of the LORD may carry you when I leave you. If I go and tell Ahab and he doesn’t find you, he will kill me. Yet I your servant have worshiped the LORD since my youth.
notice how the spirit of god is distinguished from god himself and yet still the old testament is firm in that the god of israel is only one.
Proverbs 30:4 — Who has ascended into heaven and descended? Who has gathered the wind in His fists? Who has wrapped the waters in His garment? Who has established all the ends of the earth? What is His name or His Son's name? Surely you know!
i could keep going but let's stop here. the fact of the matter is that each person of the trinity is found extensively within the old testament and you merely displayed your ignorance of scripture by implying that this had changed with the advent of the new testament.
that said, you still have not provided us with a logical basis for your questions. it does not seem as if you understand the rules of logic and argument and since i can't assume that you have even taken an introductory logic class, i will have to try to explain things to you. when you make an argument (as you did on the matter of explicit statements for the trinity) and an individual attacks the premises of your argument (as i have done by showing your argument to be illogical, inconsistent and false) then you must first prove the truth of your argument before we can at all move on seeing as whether i answer it or not would still not change the fact that your argument would still be considered wrong and you would have no point either way. hence, please defend your argument and show to us all how yours is in fact logical and consistent to your islamic beliefs. on that note, given that you call the christian concept of oneness illogical please also take me to task on my concept of oneness. you know where i speak of oneness, so please start quoting these posts and show us how i am incorrect in my understanding. since we're at it, i would very much also like a defense of the recurring misformulations of the trinity within the qur'an. nevermind whether the trinity is true or not, it doesn't change the fact that allah would surely know what the trinity is and as such i would indeed enjoy an explanation for why the very text which muslims use to condemn the christian trinity actually condemn everything but the trinity.
i'll be waiting.