That is false. Evidence can be looked for when we need to decide if the idea is true. Until then, why can't we just discuss the possiblilities?
If you wanted to discuss things that hadn't already been thought through, investigated and evidence obtained for, that would be a reasonable thing to do. But what you actually want to do is say that the things we know from studying them are wrong. You can't do that without having some evidence to backup your assertions.
Hitch can rot in hell for all I care.
You're not going to improve your 'rep' around here by saying things like that. Many of us admired and respected the man, he's a great loss to intelligent thought and writing.
Life, don't talk to me about life - Marvin the Paranoid Android