After the Paleto Score, I switched to Franklin and got an email from someone named Brother Adrian. There was a link to an in-game site called mydivinewithin.com. There was a questionnaire, similar to the one from the Epsilon Program. Long story short, I answered questions, got follow-up emails immediately and donated around 10k+. At the end, they said I'm in full control of my inner self blah blah... and they said I got a commemorative Children of the Mountain t-shirt and they'll harass me in the future about advanced courses for the rest of my life.
So what is this? A random event? A side mission? Did I really donate $10k+ for a t-shirt? (It looks alright at least) Is there any significance to event? I checked everywhere and there's very little information on this.
I didn't get this IIRC in my first playthrough, either. I believe I met a black reverend preaching on the street somewhere around Davis. I think it's necessary to get the email but I'm not sure.