HUGE topic which it takes all of the Bible and decades of understanding it to explain, but in short:Please tell me where is that church..gates of hell not going prevail..please explain.
the 'Church' as Christ defines it, is His Body of believers as individuals united as one for the purpose of continuing to demonstrate & promote the Gospel which He started through His first advent.
the 'gates of hell', i believe is the kingdom of the darkness which exists behind the physical realm consisting of lucifer and a miriad of other fallen anglels, which opposes the Kingdom of God/Body of Christ on earth.
each one of us wills and chooses which kingdom we pledge our allegiance to promote, whether wittingly or unwittingly based on the moral decisions we make and philosophies we embrace.
i think that's about it in a nutshell:)