I have been in the Goyish business world for many, many years. I have gone to goyish funerals and stood outside the door. (it showed my respect AND my religious beliefs)
I have gone to Goyish weddings, gone in, (so long as it was not in a church) said Congratulations, left my gift on the gift table and left.
There are ALWAYS two ways to handle these problems that pop up all the time.
1. NEVER, no matter what the situation, go in on an office gift. ALWAYS send your own gift, donation, etc. This way you have set a precedent and no one will ever be offended.
2. Sorry, I have a conflict is a much better answer than I can’t, I won’t, my religion won’t let me, etc. MAKE sure you DO have a conflict – even if it is to go out to dinner with your spouse so you are not lying.
Office politics is a very tricky situation and you want to avoid being the office PROBLEM, otherwise, it will impact your work, your workers co-operation and promotions.