Americans United for Separation of Church and State

Check out this site for ways you can get involved.  Be informed of the church-state issues and contact your lawmakers with your opinions. 
https://www.au.org/get-involved

Visit the Resources page to see recommended books, download free brochures, learn who's who in the world of the religious right, and brush up on the history of the separation of church and state -- the real one, not that Dave Barton baloney.
https://www.au.org/resources