Genesis 3:15 is the authority, The Creator elected His holy prophet Moses to pen. Moses did not pen first hand account. How disappointed will you be when you discover that Moses is a Christian?
Chrstianity claims Psalm 22 refers to J*sus. Why do you accept chrstianity's claim at face value? The claim is not actually in the text of the TaNa"KH but imported from outside.
David is the key, the root out from which was foretold the coming of the Saviour.
ARG! How do you know the Tree of Life is J*sus? Genesis doesn't say it's J*sus--the "new testament" does. Why do you accept the "new testament" and its interpretation of the Hebrew Bible from the very outset? You don't even subject it to proof; you accept it as a given! Can't you see how fallacious that is?
Deuteronomy 32 is the song the over-comers will be singing. And The Creator plainly states there are two rocks. Regardless of what any human claims The Creator did foretell all things, and obviously He does not force any or all to believe or accept. It is an individuals decision. None believed Jeremiah when he warned the king of Babylon was coming to take captive, and yet it happened. We are just going through a repeat of similar events and the majority of the peoples do not have a clue where in the course of events we are this day. Why we are even revisiting the acts of Sodom and Gomorrah as was foretold.
Why do you even care what Christians believe?
For myself, to guard against their becoming muslim, either through coercion or lacking the true courage of their own faith to resist.