Today. Put on your thinking caps and get to work. Show how the mystery and morality of the world is just as valid and sacred through the eyes of science. Tell someone that reason and science are co-habitable with religion, but that church and state need to stay separate and government needs to stay out of personal religion.
http://www.nationaldayofreason.org

Many who value the separation of church and state have sought an appropriate response to the federally-funded National Day of Prayer, an annual abuse of the constitution. Nontheistic Americans (including freethinkers, humanists, atheists and agnostics), along with many traditionally religious allies, view such government-sanctioned sectarianism as unduly exclusionary.
A consortium of leaders from within the community of reason endorsed the idea of a National Day of Reason. This observance is held in parallel with the National Day of Prayer, on the first Thursday in May (5 May 2005). The goal of this effort is to celebrate reason – a concept all Americans can support – and to raise public awareness about the persistent threat to religious liberty posed by government intrusion into the private sphere of worship.