A lot of my extended family were drunks when I was growing up, out-n-out drunks. I think that's my biggest reason I've never been a drinker. The fear of alcholism.
Anyway, whenever we get together for the holidays, I have no problems with other's drinking while I don't, and they don't feel obligated to abstain with me out of consideration.
I find a lot of them to be tight-asses when sober, anyway, and they improve with a few nips.
There's no religious worries on my part.
Also, if a drink sounds particularly tasty, I'll take a sip to see what all the fuss is about.