A lawsuit attempts to remove religion from the US citizenship oath.

I think the plaintiff's argument is valid. Even if Atheists are offered a different version of the oath, the assertion of the existence of a god (and that there is only one of them) in the standard oath is promotion of monotheistic religions, and opposition to other religions as well as to Atheism.

This violates the First Amendment.

Some states prohibit atheists from holding elected offices, and even some kinds of lower non-elected public offices. Free Inquiry has published articles about this. Courts use various twisted reasoning to refuse to consider lawsuits to overturn these unconstitutional restrictions — for instance, the excuse that "unless you have won the election, you don't have standing to sue."