They specifically call out that Christianity isn't what they're talking about, but finding Jesus. No different than taking inspiration for being a better person from any other character from a story, be they Captain America or Captain Picard. I think we can all take inspiration from the Jesus who upon finding a capitalism happening in what's supposed to be a place of respite flipped the tables and whipped them the hell out of there.

Sure. I did just fine on my own without. I only came around to Jesus after I started reading what he said outside the context of religious dogma. Lots of people figured out lots of things, some people compiled a great number of those things into a poignant and easily digestible package. I think Jesus was one of those people.

Another thing he figured out was "Your relationship with the divine is between you and the divine, you don't need priests to tell you how to pray, and doing it out in public so people see how pious you are is cringe". Jesus was about being a good person without the dogma. I doubt he'd be thrilled at the dogmatic institution erected around him.