The question of Gods existance...
FOR:
If God(s) exist(s), then he or she or they created human conscience in a way that people can figure God or Gods in different ways, means each culture has it's own religion or image of God.
So all these religions, and the differences between them, are compatible with the existance of God(s).
You cannot talk about a "Christian God" as a fact. God(s) has then created ALL humans and all cultural contexts (even atheism!)
You cannot have distinct Gods creating distinct groups of peoples, distinct religions. If you have more than one architects for building your house, they must cooperate, they cannot work "each on it's own".
Distinct images of Gods and religions ARE NO PROOF AGAINST religion and God.
AGAINST:
If Gods do not exist, then something else created world religions and the images of God. The human imagination has so!
Gods images and religions are NOT A PROOF for existance of God. Because the philosophic and affective capabilities of human brains can create religions as well as any other myths.
Finally:
the question if God(s) exist(s) will remain open forever. We will never find a proof for or against existance of God, on this earth.
Maybe if God and life after death exist, then those who are gone away, know whether God exists...