The Pledge is not simply a passive reference to religion. It calls on every child in public school to affirm that our country believes in God. No child should go to school each day and have the class declare that her religious beliefs are wrong in an exercise that portrays her family as less patriotic than God-believers.
MORE: http://www.washingtonpost.com/blogs/on-faith/wp/2013/06/19/the-right-to-blaspheme-for-no-god-and-country/