[Debauchery]

I was raised in a really strict catholic home growing up and as a result I am less than religious now, so I kinda get where you're coming from.
Just tell her straight up that you don't have the same beliefs as her and ask that she respect that while also respecting that fact that she takes her beliefs pretty seriously and probably only wants you to be "protected" because she loves you.
Like my mom knows I don't believe in the catholic/christian god and she still tells me that she's prayed for me at church. Is it necessary? No, but as long as she doesn't try to drag me to 5 AM mass then I don't really care.