I just love to have some of those long debates with my mother about god an all that stuff, but it's just that... debate. You can't go further with someone that truly believes in something, even if you could actually prove something about religion, it would still be hard for many to even start thinking otherwise.
The hard thing about this is that, like in many other fields, religions tend to have tons and tons of hardcore fanatics which can't seem to realize where their rights end and the decisions and choices the other ones make cease to be THEIR BUISNESS, after all... tolerance is preached by most of the religions today, but none seem to abide it.