READ RULE 8.
8. Preaching/Proselytizing
Creating (or linking to) content intended to convert/recruit others to your religion, spirituality, sect/denomination, or lack thereof is not permitted. Similarly, attempting to convert others away from their religion, spiritual convictions, or sect/denomination will also be considered a form of preaching.
Stating opinions as a definitive matter of fact (i.e., without "I believe/feel/think" language, and/or without references) may be moderated as preaching.
It's referring to religious beliefs. Not scientific fact.
Why do I have to spell this out for you??
On this forum you can say 'I believe no theist has presented good evidence for his position,' because it is not a fact. And I don't care how you feel about this. The same as the theist has to say 'I believe the Atheists haven't presented good evidence to disprove the existence of G-d'.
If you don't like the forum rules that's not my problem.