I'm checking with my mom. They divorced 20 years ago, so she isn't sure what she has, but she said she remembers that he didn't have a birth certificate when they got married and they used a baptismal certificate instead and she is certain she wouldn't have that. The thing is I didn't apply to become a citizen through my dad, I married a US citizen and moved on a K1 and have been a permanent resident for 9 years. My father never held a US passport, and doesn't meet the residency requirement (5 years residing in US, 2 years after the after of 14) and I'm over 18. With the birth certificate I need to have a valid reason to request it and the reasons to provide don't include immigration or child requesting, but I'll pick something that's close enough and fax them my RFE as evidence.
I'm waiting to hear from a tier II person on this, because even if I get these documents (which I don't know if I can), my bigger worry is they deny my N400 through marriage/residency and say I have to apply as a child of a US parent and then it's denied because of the reasons above. Got to love that they were fine to approve my K1, Green Card, etc. My dad's country of birth is on my birth certificate and the application.