when he said what he said, not being God is not what he meant, he wasn't saying that. Jesus being part of Elohim from eternity, He is the Word of God, he is YHWH. He has a special relationship with the Father, as the bible puts it for our understanding, he is in the bosom of the Father. As the Christ gave himself to die for our sins, he took on our sin and became sin, and in doing so the Father looked away. It is this feeling of being God with the Father in heaven at one point, then having his relationship with the Father seperated by sin and being put to death in such a excruciating way as he called out to Him is what was extremely painful for Christ, and is why he said what he said. Ultimately, he is the Saviour because of what he did on the cross for us.