If this theory is true then Jace doesn't believe that the Pastor could remotely be his dad, likely on the chance that he'd be a somehow worse dad than Richard. He could have figured out that his mom had an affair with Pastor, but refuses to accept the possibility likely because he doesn't want confrontation and really hates anything that may destroy his view on reality.
One interesting thing Jace does continuously is he has refused to say Pastor Faggots name on every account to this day even having his sim be named Pastor Faggot. Actually, that being said...
Why the hell was Pastor Faggot the only human he let be in his post apocolypse non-blood related family that wasn't a ghost in the last Sims 3 segment? That seemed really weird to me and I'm not really trying to tie it into this whole dad theory but, it just makes me wonder if there was any significance in that.
I think we know what church he goes to, but I forgot. Anyone else remember?