Different religions

So my husband is Catholic but not practicing he doesn't go to church really or kno how to answer a lo about his religion. I'm nondenominational. My concern is once my child is born with will be soon I know his mother (very Catholic) and will want us to baptize the child. I'm not trying to offend anyone who's Catholic but I as a nondenominational Christian don't agree on baby baptisms and a lot of other Catholic believes. She's really pushy and I know it's going to be really annoying how can I best defuse a fight or argument without hurting or causing conflict?