For instance, he may label the thread "[... Caucus]" if the article does not mention the beliefs of non-members of a caucus. Or if he doesn't want a heated debate, he may label it "[Ecumenical]".
If the thread is labeled "Prayer" or "Devotional" no debate of any kind will be allowed.
If he doesn't label the thread, it is "Open" by default and posters may argue for or against deities, beliefs, religious authorities, etc.
Click here for more guidelines to the Religion Forum.
I find them a fair balance between the need for free speech maintaining intellectual honesty on the one hand and civility in an orderly but anonymous forum on the other hand.