Catholic Church, Pregnant, MIL problems?

I just found out I was pregnant on Friday. My In-Laws are VERY VERY Catholic. I was raised catholic until I was thirteen, but then I became disillusioned. MY husband was also raised catholic, but no longer believes in the teaching of the church. Ever since we got married my MIL has been harping on us trying to guilt us into having our marriage "blessed" and now she wants us to baptize our child. My husband called his father to explain to him that he is no longer catholic and FIL now thinks my husband is conflicted and having a crisis of faith. We have to ride in a car for half a day with them next weekend and I know that this is all they will talk about. They expect us and our child to be active members of THE CHURCH, but we believe in a more earth based type religion (this we have not told them). Anyway to end the really long question what should I do? I know when my baby is old enough MIL is going to try to give him/her the Catholic upbringing that we are not.