"Invited" by super religious step-mom and dad to creationist seminar So a little backstory...

I'm 18 years old. I'm a programmer who will be entering the workforce come November. My dad and step-mom are extremely religious (my dad MIGHT believe in evolution, though I'm quite certain my step-mom does not). I'm very nearly financially independent and I can rely on my mom (who is agnostic) and friends to help me out if the worst happens. 

The seminar is called "Who Needs God? Let's Talk About It". It's for an hour every Sunday for three weeks. I told my dad that "I didn't want to talk about it" and he told me not to be an ass. So long story short I was bullied into agreeing to go. 

What the fuck do I do? How do I get out of this? 