By whose authority does man claim FREEDOM to worship any god? 1GOD, man, devil?

By whose authority does man claim FREEDOM & RIGHT to worship any god?

...By that of the 1GOD,defined by Christ, Who commanded NOT to worship any other god?
...By that of man, therefore placing his authority equal to/ above that of the 1GOD?

• but the devil, satan the adversary, was the first to claim this same authority.