It isn't just atheists. Many Christians and their Churches are pushing for change in their churches as well.<quoted text>
Humanism has enjoyed one victory after another at the church's expense since the invention of the modern secular state in 1776. Later, we banned slavery despite biblical support for it, then the ban on interracial marriage, then the ban on abortion, and most recently, the ban on same sex marriage. The church also tried to interfere with divorce rights and the right to access to contraceptives, but they were defeated there as well.
This issue may be next - church's role in politics and tax exemprtions. It's a hot topic in my local freethinkers group, and it's one that David Silverman (president of American Atheists) and the Freedom From Religion Foundation (FFRF) frequently address. This battle will also be waged in the courts:
"FFRF sues IRS over preferential treatment of churches "
"FFRF Sues the IRS to Enforce 501(c)(3) Electioneering Restrictions"
"American Atheists is Suing the IRS, Claiming That It Gives Preferential Treatment to Religious Groups"
IMHO the only ones who are resisting the changes are the money and power hungry leaders of the Churches and the ignorant masses of "fundamentalists". If only we had let the Southern Sates go their merry way 150 years ago, we northerners would be much farther along in the struggle for human dignity for all.