If Jesus was God, why did he pray to his Father in Heaven??
Because The Word stripped himself of all authority in order to come to this earth as a man. He was fully dependent upon the Father and the Holy Spirit. All the way to the Cross, ressurection and ascending into heaven to be seated at the right hand of the Father. When Jesus Christ comes back? It won't be as a little baby in a manger! Nor will it be as a man! Ten thousand times No!
When Jesus Christ returns He is coming back as King of Kings and Lord of Lords! Those who will receive Him now? Will be with Him on that day! What a glorious day it shall be too! The best is yet to come, Moonglow!
If Jesus is God then presumably he is omniscient. If this is true, then when he allowed himself to be sacrificed, didn’t he do this with the knowledge that he was immortal? If so, then how exactly was it a sacrifice for him? What did he sacrifice?
“If Jesus is the son of god, but also god himself, then he supposedly sacrificed himself to himself to save what he created from himself. He also, therefore, prayed to himself and begged himself not to require himself be crucified in order to appease himself and save the world from the wrath of himself.”
Most atheists fall into the category of ‘Agnostic Atheism’ – they don’t claim to know with certainty that god does not exist.
Conversely, most theists are ‘Gnostic Theists’ – they claim to know with certainty that their particular god exists.

When most atheists say “God does not exist” they are generally speaking in the same manner as when people say “Leprechauns/Santa Claus/Fairies/Unicorns don’t exist” – those things do not appear to exist within contextual reality in which we find ourselves.