Perhaps a better approach is to let people believe as they wish...I saw a stage 4 cancer disappear from prayer...

Whoo, boy - see, this is where the difficulty comes in. You "know" that prayer was the causative agent how, exactly?

Accepting any looney claim that comes along without proof is what got us into Iraq, why certain individuals still think "reaganomics" works & the like.

"Letting people believe what they wish" is not necessarily a benign option.