Just because somebody believes in a religion doesn't mean they have nothing to teach you. As far as I can tell through the internet, both are good honest people.

I don't think that it is an overstatement to say that Peterson alone has helped millions improve their lives through his books, talks, and interviews.

Prager is no different from the Rush Limbaughs of the world. He’s another divisive conservative talking head fomenting the culture wars they need to stay relevant.

Whether or not the changes many have made in their lives as a result of Peterson’s work are improvements is also debatable.

I suppose the hundreds of people that have made a point to personally thank him for showing them a way to improve their lives are just lieing about his influence. /s

Is personal thanks a useful metric in this case?

People give thanks to prosperity preachers for their spiritual guidance even as they sit hungry watching the preacher drive away in his Bentley purchased with the money they tithed.