Ashitaka is right, IMO.
Us humans are imperfect and judgemental. If someone wants to trash God, that's ok with me, but I wouldn't consider that person gutless nor would I take offense just because I still strongly believe in God.
In my experience, when I have spoken to JWs about any of their doctrines, their defense mechanisms kicked into high gear if I in any way bashed their beliefs or their literature. I think that it only further reinforces their views of "apostates" or "apostate literature" when we engage in name calling or God/Jehovah bashing. It really doesnt help at all.
I can't say that I have been able to convince anyone in the past 20 years to leave the WTS, however, I know for a fact that doubters far exceed the number of true believers, but it's really hard taking that first "step" towards exploring all the lies and deceit of the Watchtower society, and finding one's own way.