'Annie Laurie Gaylor speaks with a soft voice, but her message catches attention: Keep God out of government.

Gaylor has helped transform the Freedom From Religion Foundation from obscurity into the nation's largest group of atheists and agnostics, with a fast-rising membership and increasing legal clout.

Next week, the group started by Gaylor and her mother in the 1970s to take on the religious right will fight its most high-profile battle when the U.S. Supreme Court hears arguments on its lawsuit against President Bush's faith-based initiative.

The court will decide whether taxpayers can sue over federal funding that the foundation believes promotes religion. It could be a major ruling for groups that fight to keep church and state separate.

"What's at stake is the right to challenge the establishment of religion by the government," Gaylor said.'

Talk about rockin' the boat.