I find his wishy-washy attitude towards religion annoying in particular.
He's said things that lead you to believe he might be an atheist or agnostic, but then he constantly quotes the bible and calls it a "meta-story"... *shrug* Virtually everything in the bible has been in other religions.
He's just on the way to figuring out that he is a Pantheist. Pantheists are frustrating to both atheists and traditional theists, because Pantheists both agree and disagree with both camps, depending on definitions/semantics.
As a Pantheist myself, I can find myself having excellent discussions with both atheists and traditional theists - but only up to a certain point and then I lose them (but for different reasons). These two groups may consider me to be "wishy-washy" from their limited perspectives, but this assessment merely informs me of their ignorance and/or lack of objectivity.
Most Pantheists are particularly interested in the function (and resulting altered states of consciousness) of entheogens, as Peterson is.
Peterson's description of the Bible as a "meta-story" is bang on, in my opinion. It is important to understand what the pre-fix "meta" means in this context.