Trinitarians assert that ‘God is the Father, the Son, and the Holy Spirit’ all rolled into one God, but three entities at the same time. Of course, this makes no sense, but let’s see what the Bible says:
“We know that ‘An idol is nothing at all in the world’ and that ‘There is no God but one’. For even if there are so-called gods, whether in heaven or on earth (as indeed there are many ‘gods’ and many ‘lords’), yet for us there is one God, the Father . . . and there is but one Lord, Jesus Christ“—-1 Corinthians 8:4-6 NIV.