Talking Christian
To say things you are certain are false, but you know you can get away with it.
Rudy was saying the election was rigged, but he was just talking christian. Donald said he was working late, but Marla knew he was just talking christian.
Talking Christian
To state something as fact, that you just made up. Or to convince someone of something you don't actually believe yourself.
Does he actually believe that, or is he just talking Christian. Susan said she was going to pay me back, but it's obvious she was just Talking Christian.