Do atheists want to take religious freedom from Christians?
No, of course not.
Atheists simply want the religious folk to stop imposing on everyone else. We tend to support secularism.
For instance, in the U.S., the Christians keep trying to wield government institutions to proselytize to others, or legislate Christian "values" on everyone else. When others oppose them, as self defense, the Christians declare that they're being persecuted, even though it's really the other way around. That's usually where this page's question originates.
Secularism is when the government stays neutral on the topic of religion, the government doesn't have any bias on any religion, and no religion can influence the government. This establishes a societal framework in which any person from any religion (or not), can exist freely.
It wouldn't make sense for atheists to revoke religious freedom, since the only reason atheists can safely exist (for the most part), in the U.S. is because of that religious freedom. It wouldn't take long, if the U.S. is converted into a theocracy, for atheists to be lynched.
Secularism benefits atheists as much as it does any religious faction. Many atheists, of course, would prefer no one was religious, but generally respect others' right to believe as they will, and would in fact fight to defend that right.
The "freedom of religion" is not, however, a freedom from criticism. Criticism is not persecution. You are not free from offense or feedback when you exercise your first-amendment rights (in the U.S. in particular).
...nor are we.