The only thing that will convince an atheist that feces christ exists is for a dead person to get up and walk. Let's find some killed in an industrial accident (his head cut off, so there's no chance he's still alive after three days) and tell the christards to get "god" to bring it back to life.
If their "god" can't do it, then it doesn't exist.
If the christards respond with, "You don't test god", then they should STFU about it.
Atheists are not interested nor swayed by fictions or the bullshit of faith. If you have no evidence, you have no argument. The buybull is not evidence, it is the claim, so don't say it is.
It's called the buybull because you have to buy the bull to believe it.