Of course, Mormonism isn't the only religion out there! Sometimes I like to discuss all religions and none:
First of all, there's another religion that's a part of our family religious heritage: Catholicism. My husband is a cultural Catholic in about the same way that I'm a cultural Mormon. So, naturally, we took our kids to Lourdes and had lots of amusing adventures there!
Non-belief doesn't obligate you to give up your holiday traditions (unless you want to), as I've discussed on Easter and Christmas -- including a list of Merry secular carols!
As for Christianity in general, I have to admit I'm not too pleased with it. It seems to inspire some disastrously short-sighted politics, and I'm not convinced you can do much better when saddled with the morals of the Bible. And -- as far-fetched as Mormonism's story seems -- it annoys me to see Christians applying a double-standard of evidence when it comes to the Jesus story. (Their position on the death penalty is also a little counter-intuitive.) Ultimately, I think polytheism makes more logical sense than monotheism+omnipotence. (Spock and Harry Potter also make a good showing.)
Sometimes the believers indicate that they don't think very highly of faith/religion, either, when they try to discredit atheism by calling atheism a faith or a religion.
That said -- even if we disagree -- I think it's important to get along and make a real effort to understand one another. As I explained in a couple of parables about belief, just because we disagree doesn't mean I think you're stupid. And when it comes to personal relationships, it's generally not constructive to harass and harangue people about how wrong you think their beliefs are. Interfaith relationships can be a challenge, as I discussed in "He has his faults, such as being a perverted-democrat-atheist, but....
Even politically, I think that fighting for a shared secular space is more constructive than trying to stop religion (which led to my joke about being a sniveling milquetoast).
Of course, being an atheist isn't all fun and games. That whole death thing is a bit of a drawback. Plus, we're so despised that sometimes even the other out groups shun us. So it's not easy to be "out". Are you? ;^)