How does one go about changing their religion?

Changing religious preference is a Personnel Action Request (PAR) in IPPS-A.

And because this will likely be his next question, getting the beard is a longer process involving several interviews with the chaplain, and a memo from the chaplain to get a memo from the BDE CDR.

Minister or Google, personal choice.

Have him talk to a minister. Thank you.

Just sit down with the S-1 clerk and have them change it I'm IPPS-A. No paperwork, commanders or chaplains required.

I am old school so bear with me here. You got to S-1, fill out a DA-4187 for change of religion. It's that easy. They don't even ask for you to prove it.

So, when I go into the Army, I'm at Ft. Sill and I'm filling out a form and the question of religion is on there. I check off No-Pref and think nothing more of it.
A couple weeks later we're getting our dog tags and our D/S are telling us to make sure the info is correct.
My dog tags say Jewish not NOPREF.
Because, you know, the Army would never make a mistake!
I tell my D/S and he basically says all the important info is right, and since I asked for NOPREF a rabbi is just as good as a priest.
Fair enough, I let I go.
Fast forward to 1990 and I'm PORing to go to Dessert Shield and one of the clerks catches the fact my dog tags say Jewish. I'm asked if I'm actually Jewish and if so, I may need modified orders.
I get new tags that say NOPREF and go to Saudi Arabia with the rest of the unit.
One night while we were sitting around, bored out of our skulls, religion comes up.
I tell the story about my old dog tags and my Section chief pipes up that if I had said I was Jewish, I might be sitting in Germany with the rear element instead of the sandbox sweating and playing spades.
This story is in no way helpful to the original question, but I had to sit and listen to old men ramble on today at the VA and now I'm paying it forward.

Capt Prickett it spot on!

Depends on what he is trying to accomplish. If he is trying to update his dogtags and all of his paperwork like that have him go to S1. If he is trying to get religious services or guidance have him get with the local Chapel Staff or his Unit Chaplain.

I went from Jewish to Christian Had to provide change information to base personnel office. They updated my AF records. Readiness branch made new dog tags. Probably all done on computer now. Check DEERS.

It depends on many factors. There are churches in which there is nothing wrong with wanting to be in another religion. Nevertheless, it would be kind of you to let the leadership know, just for the sake of formality. This is a confusing question because I have been serving at https://firstchurchlove.com for about 5 years and have never heard of a situation like this. I don't mean to say that we are the only right dominion, but still most people choose to stay with us after they know the real God. And we are always happy to accept them and bring them to their real Father. I have never heard stories of our brothers and sisters wanting to change all religion.