That's true, a lot of sermons by Paul Washer say similar, that there is no distinction between the secular world and how some Christians behave. I'll check this video out.
I agree with Jesse on this. Often, if a woman respects you and has a good relationship with her father, it's far easier to bring her to Christianity and live with her than it is being with a woman that has been "Christian" her whole life.
I also agree with Jesse when he notes how so many Christians read the bible, go to church, but fail to behave in a Christian way. He says they 'know about' God but they are not 'of him'.
In particular I see this a lot with Baptists and other Evangelicals.