The ACLU fights for, among other things, the individuals right to the free exercise of religion. That includes the right of Christians to celebrate Christmas. Despite what Bill O’Reilly says, there is no ACLU sponsored “War on Christmas.”
"As part of our justice mission, we work hard to protect the rights of free religious expression for all people, including Christians. For example, we recently defended the First Amendment rights of a Baptist minister to preach his message on public streets in southern Indiana. The ACLU intervened on behalf of a Christian valedictorian in a Michigan high school, which agreed to stop censoring religious yearbook entries, and supported the rights of Iowa students to distribute Christian literature at their school.
There are many more examples, because the ACLU is committed to preserving the constitutional guarantee of religious freedom for all. We agree with the U.S. Supreme Court’s firm rulings that this freedom means that children who grow up in non-Christian homes should not be made to feel like outsiders in their own community’s courthouse, legislature or public schoolhouse."
The American Civil Liberties Union of Massachusetts today asked a federal district court in Springfield to protect the First Amendment rights of high school students who were disciplined by school officials for distributing candy canes with religious messages just before Christmas.
ACLU Fights for Christmas Tree
Lots more examples of the ACLU fighting for the rights of Christians to practice Christianity here: