Not in the lust of concupiscence - In gross gratifications.
Even as the Gentiles - This was, and is, a common vice among the pagan; see the Acts 15:20 note; Romans 1:29 note; Ephesians 4:17-18 notes, and the reports of missionaries everywhere.
Which know not God - See the Romans 1:21, Romans 1:28 notes; Ephesians 2:12 note.