Christ was also without sin and He said that God abandoned Him, right about that time.
That is not what he was doing. He was quoting the opening lines of Psalm 22. He is identifying himself with the Suffering Servant...aka the Messiah.
Yes, but scripture tells us He asked God a question ("My God, My God, why hast Thou forsaken Me?"). He never called God a liar, nor could He. Pope Francis is ad-libbing scripture.