I don't answer many of these like this. I hope this helps, and maybe allows you to say something......ir at least judge if you ought to..............
Lots of us dump religion way before you .....for myself, I dumped it at age 11, when my mom confessed that there was not Santa, "Keeping a list and checking it twice.................." She as well confessed no one else was either.
So, my mom was far ahead of yours.
What you have to determine is just how hammered with more of this stuff you are going to have to endure if you tell them you think in is a pile of crap.
You write well, so you're no dummy. And obviously, you're in biology, and the evidence for science and evolution is just overwhelming, and not one shred of scientific evidence agaist it. Not one..
You have three more years before you are off to college. That sounds like forever... and at 15, it truly is forever.
When I was your age, I did indeed read the bible had had some quesitons....like, "if Jesus was really a miracle worker, and the son of God, how come he was illiterate? The bible says he 'scratched in the sand".
I'd have thought the Son of God would at least be able to read.
Then there were the miracles.... if he really could do those, why did he just damn a fig tree, and put demons in pigs...........how about a REAL miracle...like curing your mom (or mine ) of cancer, or fixing the legs of a kid who had fallen off of a roof on one of his afternoons? Pigs? Fig trees? Were they serious????
Then the torcher for me was that he was the Messiah. (But like, what did I even need saving for? Sin? Those are ideas churches use to control people. There aren't any sins... there are stupid things, illegal things, and immoral things, and things that will have your friends leave you, but sins???? That's churchy stuff.)
Other stuff bothered me too:
The Messiah had to trace his bloodline to the House of David, and this was done thru Joseph. But Joseph wasn't his daddy, god was, and no one traced Mary's bloodline!!!!!!!! (Big ooops)
One claims heritage thru ancestory, not marriage. BANG!!!!!
This for me was the fatal flaw in Christianity.
It made it all just nuts.
Then I got into biology in hs, and evolution just made wayyyy more sense than some sky daddy popping people on the planet, killing your own son, talking snakes, and floating dead guys.
I pretty much decided if that stuff doesn't happen now, it pretty much couldn't happen then, either.
Then, as an undergrad, I took some grad courses in Religious Studies in New Testament. The final clincher?
If god is all merciful, all powerful, then why is there so much suffering in the world?
And no one ever came up with anything that ever made any sense to me... not at age 11, not at 15, not at 35.
(Comments like, "God works in mysterious ways....." was just crap. "You will get your reward after you are in heaven...." Yeah, sure.
And the fundamentalist sites on the internet, and the creationist sites too, are just contrary to reason, and contrary to anything I ever see on Nova, The Discovery Chanel, Nat Geo, The Science Channel, and any other peer reviewed real science.
I think with a little ammunition, you might just suggest you'd prefer to spend your time doing something other than getting preached at. "I'm 15. I know that's young, but I'm not stupid, and I know what makes sense to me. I'd rather volunteer at the homeless shelter, than be in church.... then get someone to take yo there and serve food---what ever. But yes, fully understand the wish to get out of that church and doing something useful.....
Science teacher 26 years. Grad courses in Religious Studies, Univ of Chicago's Divinity School