From my experience, we all get on no matter what our religion.
My children married out of their religion and all is well as what difference does it really make.
Having had children die before me, I am now just happy if they are happy and religion or their partners, is not really a problem as there are far worse things that have happened to me in my lifetime!
Religion is just that, and let everyone be, and have their own beliefs without judging or criticising as it is just a belief.
I don't think that religion should be a driver of whether people get on or not. You have to be tolerant of people and their beliefs, whether they be family, friends, or strangers. Unless their beliefs are totally at odds with Christianity, which accounts for most Australians, we should all be able to live and let live. We don't really tend to discuss such matters with the in laws, as it is all about personal choice., and none of our business really. Everyones beliefs are different, and to an extent private, so unless they are very blatant with their practices, and expect me to join in, it really doesn't concern me.
I agree Lluxi . . . can't see the point of poking the problem with a stick. Why on earth can't we all mind our own business?! If I had a street full of different religions and married gay people I would not care. I want people to be good and caring and love their children and take care of them properly. Their religion/sexuality should not even be mentioned. (in a perfect world. haha) (ᵔᴥᵔ)
I think the sensible ones do. My family all moved away from a religion we converted to when I was about three. My sister stayed in. No big deal: we don't discuss religion, we are very close and love each other to bits. We feel that she lives in a bubble but she's happy and nothing we could say would shake her faith. She is a rare one that really lives by her principles and it a really pure good hearted person. Arguments about religion, in particular, seem to be about as useful as pouring water into a sieve.