Freedom of religion does not mean freedom from religion. In fact, it is the complete opposite of freedom from religion. In the United States of America, we are free to practice our religious beliefs as we see fit (although, that point may be arguable of late). If you have no religion, you are free to not practice a religion. But Christians are not free to force their religious beliefs on Muslims and Jews, and, therefore, atheists are not free to force their lack of religious beliefs on the religious people of America.
The United States was founded on religious principles. Whether you like it or not, this is a religious – primarily Christian – country. If you want to live in an atheist state, move to North Korea or another Communist nation. If you live in the United States, you are going to have to deal with freedom of religion and the right of everyone to live their religious beliefs, regardless of what they may be, to the extent that they want to live them. So long as your beliefs and practices do not bring harm to another person, your right to freedom of religion is guaranteed by the U.S. Constitution and the First Amendment.
If you live in the United States of America, you are blessed to enjoy freedoms that most other people in the world can only dream of. One of those is the freedom to practice your religion on your terms. That freedom is continually being challenged, however. And the biggest threat comes from those who want to remove religion from this great country. But what they fail to realize is that freedom of religion is not freedom from religion. You have the right to practice your religion, and no one can stop you, so long as you are not hurting anyone else. Just as atheists are fighting to remove religion from this country, the religious must fight to keep it an integral part.