Correct, one should always be wise when dealing with such things. But the biggest danger comes from one's own self, clearly demonstrated in this post:
Just ignore him. Don't make other people's influence your concern - Truth will defend itself, just let it loose.
It's not scary if one is sane and rational. I used to be a complete skeptic and let me tell you, keeping a level head can be really helpful. But further spiritual development, that means not only embracing logic but also LOVE, helps the most.