Hiya Daisy and welcome
As far as I can tell here locally, the policy is "Don't ask, don't tell" in regards to oral sex. If you give up giving your man oral sex due to your religious beliefs, don't you think that would kind of piss him off? What is it about oral that you don't like? Have you tried flavored lotions? Maybe it's the taste that turns you off. Tell him to drink pineapple juice, I heard that works. If you can put up with "finishing", learn to keep the stuff under your tongue until you can spit it out in the sink...just don't make a big deal about spitting cause some guys think it's a sign of rejection. If you can't, then you can take care of his needs and let him finish inside of you during intercourse. If you really just don't like it, and it has nothing to do with what anyone else is telling you, just be honest with him and let him know. Sexual compatability is very important in a marriage, and he really should know what he's getting into and whether he wants to deal with that or not.
Now the smoking...here's how I'm trying to quit, and it certainly is not due to this religion. Doc prescribed Wellbutrin for me to start about a month before I attempted to quit smoking. This was in order to let it sink into my system and start working. Then, he prescribed Xanax for me to use after I quit. I asked him if I could also chew Nicorette gum while I was trying to get off cigs. He said absolutely and encouraged me to do whatever I needed to do. I was smoke free for 6 weeks with this, went through a particularly stressful personal situation and smoked a pack, and now I've been smoke free since Sunday evening. Do it for yourself though. Do it because you want to be healthy enough to enjoy your child and play with them as they grow. I'm praying in my own way that God makes the smell of cig smoke unpleasant for me someday...because when I pass smokers, I tend to inhale deeply and sigh as I suffer from withdrawl, lol.
I agree with the others that saying that it's wrong because homosexuals do it is really stupid. Last I checked, homosexuals urinate, deficate, eat, drink, walk, talk, blah blah blah...doesn't mean that it's wrong for me to do those things just because I'm not gay!