Honestly its not as straight forward today. Obviously anyone can refuse not to participate but as a member of a nation and reaping the benefits of that nation one should have a sense of responsibility to defend that nation. Realistically you have only grown up in your environment but there are places where many of us wouldn't have made it this far.
I would absolutely advocate the enforcement of the rights of all individuals of our nation but that is only possible because others are out there defending those rights. Some day we might not need a military but even in Star Trek (TNG) they still needed a military branch. Someone will need to fight.
If someone came to your city and detonated a dirty bomb and not only is your city but your state and many of the states surrounding your state can no longer be occupied for centuries do you think someone should have stopped them?
The insane amount of casualties involved and the long term effects of other peoples actions are something you can convince yourself to ignore but they could happen. Your idea that this god is real and you won't fight for a nation that allows for your ideas is currently a right but others are out there fighting for your ability to have this idea of your god. You may not like those people or agree with them but if they didn't fight on your behalf I don't think your ideas are sustainable.
Like I said it's very complicated. If you haven't watched Jocko or others of his caliber you should probably start there. He's been everywhere but I am an avid Rogan podcast fan so I will post a link there: