Romans 1 21
because that, knowing God, they glorified him not as God, neither gave thanks; but became vain in their reasonings, and their senseless heart was darkened.
Compare with other 3 random translations
ERV Romans 1:21People knew God, but they did not honor him as God, and they did not thank him. Their ideas were all useless. There was not one good thought left in their foolish minds.
EAS Romans 1:21Those people really knew about God. But they did not respect him as a great God, and they did not thank him. They did not even think clearly any more. Their minds became confused and they did not understand God's message.
FBV Romans 1:21because even though they knew God, they did not praise him or thank him, but instead their thinking about God turned into complete foolishness, and darkness filled their empty minds.