CHR Comment: The concern of the atheists, agnostics, and others who gather is the separation of church and state. They hold that reason and science should guide policy rather than religious ideology. A similar rally was held in 2012 with about 10,000 people attending.
The article also notes that 90% of congressmen identify themselves as Christians. Many of the other 10% are likely Jewish. Only one member of congress does not have a religious affiliation: Rep. Kyrsten Sinema (D-Ariz.).