While I agree with the spirit of these comments, I'm not sure it's lazy parenting so much as maybe "Disneyfied" parenting

What I mean is, the whole soft-focus, rose-coloured view that "my child believes what I do, and has the same strength of will I have, because, look! They're willing to publicly show their commitment by wearing a ring. So we don't have to talk about the messy stuff until the eve of their wedding, when we will have a precious Hallmark parent-child-on-the-cusp-of-embarking-on-their-adult-life discussion about how fulfilling married sex is."
For many of the very religious people I've met, they yearn for a "simpler" time when life wasn't so messy, and rely on the teachings (and this certainly doesn't apply only to Christianism) of their childhood to comfort themselves when life gets complicated. It's a rare gem of a person who actually approaches, tests and confirms their beliefs in a mature and realistic way, because that is hard, hard, hard, often with very little comfort involved. I am currently helping two family friends in their late life who have recently come to realize that they were approaching their spirituality in a very child-like way, which allowed them to be used and led into some damaging practices. They're having such a crisis because they entrusted their faith to very fallible humans and got burned, instead of approaching their God on a more mature level as they lived their lives. I wouldn't ever call them lazy - just perhaps a little naive. And I wonder if many parents who rely on abstinence-only education, virginity pledges, purity balls and rings, etc. are approaching things in the same way. To me, it seems like a lack of critical thinking skills in one area of their lives, which they may not even recognize because it fills a deep need for comfort and nurturing. I feel for them and their children - and understand the desire to "let go and let God" instead of actively working it. But I think we have to "put away childish things" including our desire to just be taken care of, and face God as an adult, as we do our physical parents. It's our responsibility to help our kids do that too.
Oh, and BTW, the idea of father - daughter "purity balls" does make me queasy - the ones I've seen detailed are very paternalistic and truly do convey the father's "ownership" of his daughter's virginity. That leads down some awfully slippery paths - I'm thinking of religiously inspired honour killings, amongst other unsavoury things. I am hopeful that these practices are not the "norm" for this movement, but unfortunately, it is the face of the movement that the public sees due to media coverage. If these practices go against your beliefs, I think you need better PR so the rest of us don't judge a whole religion on a nutty offshoot!
OK - end of diatribe! This one hit a big nerve for me.