Think of it this way.

Is it ethical to force someone to be a catholic, or a jew, or an atheist, or a hindu? I think you'll agree it is unethical. Suppose we didn't have the first amendment. Would that suddenly change the morality of forcing someone to practice or not practice a religion? I think we'll both agree it is still not ethical.

So then, the first amendment didn't create a right to freedom of religion. It described a right that already existed. It tries to bring legality in line with morality.

The same is true for the second amendment. Gun ownership isn't ethical because of the second amendment. The second amendment exists because gun ownership is ethical.