You're right, you know you are, but they won't listen.
They're not going to change.

Don't lose hope, but don't let the battles drain you.

In a few months you'll be free, and it won't matter.

Pick your battles. Nothing wrong with kicking against the pricks if they stray into some of the fairly rampantly misogynistic/homophobic territory that dwells within the RC faith, but otherwise keep shtum and bide your time.

In your shoes, I would not have been able to keep quiet. I see you're getting that advise quite often. Hey, you've got a little over a month to go. Squelch if you can, but otherwise let 'er rip. At least you tried. Maybe the seeds of doubt you've sown will sprout someday.

Well, if their haven't been any issues between you and school administration (don't want to have nothing to show for your education), then I'd say you should press the issue in your religion class. I'm betting that your friends and classmates are quite familiar with critical thinking in other areas, but they have been convinced that faith is just as valuable.

I read a great book on this called "A Manual for Creating Atheists," which really digs into how faith should be the target of those debating theism. In the book Peter Boghossian defines faith as "pretending to know something you don't," which helped me place words to my problem with religion.

In school I was taught the importance of critical thinking, and I became an atheist because I realized how I could not value both faith and critical thinking at the same time. They may show hostility to you now, but your fellow students are possibly at the best stage of their lives to begin realizing how flawed their faith is.

Do not get bogged down by debates on morality or the improbability of god or religious events. Every one of their arguments, when teased long enough, will come back to faith, and that is where their whole world-view can be taken apart.

However it goes I wish you well, I understand how weaselly Catholic apologetics can be.