First, welcome to the forum!
Now, I wish I had something useful to say to you in your present situation. Since I don't have anything particularly useful, I will ask a few questions. Is it possible to transfer to a nonreligious school? You say that your father is an atheist; wouldn't he be okay with that?
As for whether you should express your opinions in religion class, I recommend a pragmatic approach. You state that you enjoy talking about the subject, but you don't like the reaction you get from your classmates. Which is greater: the enjoyment of talking about it, or your displeasure caused by the reaction you get from your classmates? The answer to that should guide your choice.
As for the question of asking your year leader if you may avoid taking part in communion, I have no idea what the results of that would be. But, if all you are worried about is being asked to leave and ignored, how is that any worse than not asking? So if that would be the worst thing that would happen, I would advise you to ask her. If that is not the worst thing that could happen, then my advice would depend on whatever that would be. Of course, the safest approach would be to just take the communion, but I certainly understand a desire to avoid such silliness.
One minor point; you state:
"I don't really go around and force people into atheism and force them to stop believing in their God then I would just be taking away their right of belief and religion, but I just express my opinion when asked in Religion class."
How would you force them to stop believing, even if you tried? If force worked for making people believe something, don't you think the school would have done that to you?
Now, I wish I had something useful to say to you in your present situation. Since I don't have anything particularly useful, I will ask a few questions. Is it possible to transfer to a nonreligious school? You say that your father is an atheist; wouldn't he be okay with that?
As for whether you should express your opinions in religion class, I recommend a pragmatic approach. You state that you enjoy talking about the subject, but you don't like the reaction you get from your classmates. Which is greater: the enjoyment of talking about it, or your displeasure caused by the reaction you get from your classmates? The answer to that should guide your choice.
As for the question of asking your year leader if you may avoid taking part in communion, I have no idea what the results of that would be. But, if all you are worried about is being asked to leave and ignored, how is that any worse than not asking? So if that would be the worst thing that would happen, I would advise you to ask her. If that is not the worst thing that could happen, then my advice would depend on whatever that would be. Of course, the safest approach would be to just take the communion, but I certainly understand a desire to avoid such silliness.
One minor point; you state:
"I don't really go around and force people into atheism and force them to stop believing in their God then I would just be taking away their right of belief and religion, but I just express my opinion when asked in Religion class."
How would you force them to stop believing, even if you tried? If force worked for making people believe something, don't you think the school would have done that to you?
"A wise man ... proportions his belief to the evidence."
— David Hume, An Enquiry Concerning Human Understanding, Section X, Part I.
