The enemies of the cross many times are enemies of God out of ignorance. They do err not knowing the Scriptures.
The unregenerate man can not understand the things of God. Once again we are told we must be born again. We who desire to worship God must worship him in spirit and trust.
Scriptures John 4:22-26, John 5:1-30, John 14:1:38, Philippians :1-21, Acts 5:34-39,.
Matthew 22:29 ye do err not knowing the Scriptures.
The concision is the cutting away. 2 Peter 2:1-22, 2:1-18. Isaiah 56:10-11.
Only what God has established will remain. The winds will drive away the chaff.