Do you really think so? I mean that Christianity (or adherence to any other religious creed) makes people more faithful and respectful of the marriage vows of others?
I'd think it'd have more to do with personality traits myself - such as the ability to empathize and sympathize- the desire to engage in fair play- being unwilling to hurt people you don't even know...that kind of thing.
Last year I was talking to one of my students who was this nineteen year old guy and he was telling me about this girl he liked and said he had or was going to have sex with her. I knew him really well and I knew he attended not one, but two very fundamentalist churches every week - so I asked him - 'So, not that I'm judging you on this issue at all - but I'm just interested to know how you square this premarital sex thing with your church and its teachings...I didn't expect him not to have sex before he got married - god no - but I was sincerely interested in hearing some kid today line up his reasoning and logic on the requirements of his church and actually living that life today.
He said - 'Oh, that's easy...I just do what I want to do and then ask for forgiveness...' I laughed and laughed because he was just so honest about it, but the point is - sometimes I think it might be easier for so-called Christians to allow themselves these 'sins' because some of them honestly believe that they're sinning more against their god and their beliefs and the regards for that flesh and blood person they're trespassing against is secondary.
I just guess I mean I can see it going either way.