When my husband and I got married over 2 decades ago, I was a Baha'i and he an agnostic (lapsed Catholic). We did not have a similar religion, but we had very similar values, which I'm sure had a lot to do with our marriage lasting as well as it has.
When children arrive parents who were not terribly interested in religion often get a sudden interest.
My advice for anyone contemplating an interreligious marriage is -- don't let the difference stop you, but explore that area very very carefully.
I know that I was not as able to be as active as I would've like in my own religion because of the difference. It hasn't been a sore spot because I expected that. But imagine what it would've been like if he'd had a religious belief of the exclusive sort? "Hell" would be putting it mildly.
I know one woman who has been married 10 years and will not have children because of her husband's opinion of her faith. She will not have children subjected to daily diatribes about mommy's cultish beliefs, so she simply will not have any.