Answers
Was Jesus really God?
He is not presented as a good teacher who was later promoted. He forgave sins that were not committed against Him, accepted worship, claimed to have existed before Abraham using the divine name, and was crucified on the charge of blasphemy for it. Thomas called Him my Lord and my God and was commended rather than corrected. The options have always been narrower than people assume: either those claims were false, or they were true.
Go and see for yourself
Jesus said unto them, Verily, verily, I say unto you, Before Abraham was, I am.
John 8:58
And Thomas answered and said unto him, My Lord and my God.
John 20:28
For in him dwelleth all the fulness of the Godhead bodily.
Colossians 2:9
In the beginning was the Word, and the Word was with God, and the Word was God.
John 1:1