26 Above all other reality there exists one supreme Being: God, the omnipotent Creator of all things, the all-wise and just Judge of all men. This supreme reality, God, is the absolute condemnation of the impudent falsehoods of Communism. In truth, it is not because men believe in God that He exists; rather because He exists do all men whose eyes are not deliberately closed to the truth believe in Him and pray to Him.
Source: Divini Redemptoris (Vatican.va)