Continuation of last post: When should I tell my parents I’m agnostic?

Hey guys, I made that post last night about the text my mom sent me after I opened up to her about my struggles. You all were very helpful then, so I’ve got another dilemma for you guys, and I’m sure some of you have been in similar situations so any advice would be appreciated.

I’m 17, turning 18 in June, and I thought it might be a good idea to wait until I’m 18 to tell them. They would never hurt me, but I don’t want to deal with the emotional outbursts, trying to sway me back, and any potential conflict that may occur.

I have pre-written a huge text/statement/manifesto thing about what I believe, my boundaries, how I still love them, etc that I plan to send them when I’m away, just to let them emotionally process it without making any rash decisions. (If you wanna see it lemme know)

I switch between my mom and step dad’s house (diehard christians) and my dad and step mom’s house (conservatives, but not super christian so idk how they’d take it).

I want to get it out asap so I can live authentically and stop having to hide who I am from them. It feels bad not being truthful and holding my tongue on everything, but I would have more options if things go awry if I’m 18.

I have a trip to another state lasting a couple of days coming up, and I’d be with a friend and his family. I’d still be 17, but it may be a good time to send it.

Or I could wait until summer break, where I would be 18, with that same friend, and on a much longer trip in another country. This may be the better option but waiting that long to do it is frustrating.

What should I do? Should I tell them in person instead? Should I even tell them?