Your fellow Marine, who is a heretic, gets killed saving your life. Do you attend his funeral?
Yes, you attend his funeral at the cemetery. You skip the mass at the NO church or protestant building.
.
Emile, your failure to make distinctions is your problem. It's "all or none" for you. That's not how life works.
You also, because you're a woman, put too much emphasis on society/family and not enough emphasis on principles/facts. God made women to be this way, but it's not all good. You need to recognize you have this built in bias and beware.