I TAKE THEM AT THEIR WORD.
I let them decide what they believe, and I merely ask for proof of anything that could potentially have proof. If they choose to believe that the Eucharist is symbolic, I have nothing to say on that count. If they choose to believe that illness can be cured via praying really hard (some Southern Baptists I've known do believe this), they're talking science and should provide proof (or at least point to someone who can).
And if they don't have any proof, they're contradicting known science, in the realm that science can discuss--and therefore they are in conflict with science. Which was my original point, before we got off on the (still on-going) tangent about whether an atheist can know what a theist believes or not (which has now become "Can we trust what theists say they believe?").
Seriously, have you read ANYTHING I've posted other than what you quoted? I've explained this before.