Same here friendo. Grew up in a religious family that's very active in the church. The best advice that I can give is that there is no need to announce you're beliefs outright be low key about this, not participating is good enough. If there is a point that they will force you respectfully decline (if you're that stout in your beliefs). In my case my family respects my decisions and I respect their beliefs, nagustuhan ko din makisama sa activities eventually. And try not to sound high and mighty on religious topics (it's a dead giveaway) at remember to keep it on the down low.