Can atheists convert theists?

[Knight]

Issues of burden of proof aside, the point is that if it can't be disproven, then it's reasonable for the belief to remain.

I would not use the word "reasonable." It's "possible" for the belief to remain, but reasonable suggests actual falsifiable evidence. The logical implications of that philosophy are absurd, because you would have to accept the possibility of an infinite amount of beings existing in an infinite amount of ways, when we cannot even observe, measure, or detect one. If we accept the God of everything, what's stopping us from accepting the God of nothing, God of everything's immortal enemy? Or Chronus, the God of time? Or Flying Spaghetti Monster, the magic teapot, or invisible unicorns on the moon? The list goes on indefinitely. This is why we must have a falsifiable method of sorting out reality from beliefs.