The original Mass was in Greek in the East, — we don’t know whether it was in Latin form the very start in the West. English today has sufficient power to express the thoughts of the Gospel. I, too, regret many things about Vatican II but I would not put forth the abandonment of Latin as the foremost complaint.
Existence of God is certainly provable. The physical universe proves existence of the Father; the Gospels prove the salvific power of Christ, and the two thousand years of the Catholic Church prove the existence and power of the Holy Ghost. The problem of agnosticism is not the lack of proofs, but the lack of faith in assessing the evidence in front of them.
I know all that...it was a joke. Yes, the gospels were in greek, sometimes with aramaic words included.
I think we have different definitions of the term "proof".