Speaking for myself dunitall, it was because of people questioning my own beliefs as a Christian, that I delved deeper into my own beliefs and found them wanting. If it wasn't for others questioning me then I might have carried on for years believing this bunkum (I was young and impressionable at the time but matured enough to face FACTS and had no choice in the end but to jettison religious beliefs)
I guess that maybe I can maybe get others to do the same...we live in hope!