Romans 1:21 NKJV because, although they knew God, they did not glorify Him as God, nor were thankful, but became futile in their thoughts, and their foolish hearts were darkened.
John 4:24 NKJV
God is Spirit, and those who worship Him must worship in spirit and truth.”
It’s not enough to just believe God exists. He is seeking those who not only think He exists but those who also *live* according to the knowledge. “He does not believe who does not live according to his belief” ~Thomas Fuller.