Let the bible answers our question.
35 To you it was shown, that you might know that the LORD Himself is God; there is none other besides Him.Deuteronomy 4:35, NKJV
5 I am the LORD, and there is no other;
There is no God besides Me.
I will gird you, though you have not known Me,Isaiah 45:5, NKJV
21 Tell and bring forth your case;
Yes, let them take counsel together.
Who has declared this from ancient time?
Who has told it from that time?
Have not I, the LORD?
And there is no other God besides Me,
A just God and a Savior;
There is none besides Me.Isaiah 45:21, NKJV