If someone decides to drop you as a friend just because of a hobby/lifestyle/religious belief, then i would have a good think if i would still want them as a friend.
I personally hate narrow-minded people who immediately judge you by what you where, what your hobby's are etc. Strying to get them to consider other people's opinions rarely has a positive effect.
And although its always crap to lose friends because of something as "stupid" as a hobby or interest, when family members get involved it can get quite ugly..
Luckily most of my family are Atheists, and the rest is mildly catholic so no problems there. I Guess if they had problems with my hobbies it would be a shame for them. I Would never change because of the opinion/pressure of my family(only my parents). i
would try to keep the "exposure" of the hobbies down to a minimum to avoid drama.