Q.52: What is forbidden in the first commandment?
A. The first commandment forbids the denying, or not worshiping and glorifying the true God, as God and our God, and the giving that worship and glory to any other, which is due unto Him alone.
The fool has said in his heart, “There is no God.” They are corrupt, They have done abominable works, There is none who does good. Psalm 14:1