[M]embers of Congress have no business issuing an "official call" for Americans to turn "back to prayer."  Members of Congress certainly may pray, and they may play active roles within their respective religious communities.  They also may form unofficial groups that meet for worship, prayer, and Bible study on government property just as other unofficial groups do.  But their stations as government officials do not entitle them to attempt to lead us in spiritual pursuits.  We've got plenty of religious leaders who can do that, thank you very much.  It's not the government's job to promote religion; it's the job of religious communities.
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[T]he Representatives cannot have it both ways.  If they send out a press release with their titles as government officials, purport to issue an "official" call for prayer, and hold an event on the steps of the Capitol, they cannot say that the whole thing is somehow non-governmental in nature.  

Again, members of Congress can engage in religious activities and speak in personal ways about their faith convictions.   But their jobs as members of Congress are to legislate, not to lead Americans in prayer, and they need to remember that.

Presidential proclamations are one thing - recognizing a day of prayer and all of that. But the "official" business of the House is done inside the Capitol, and with respect to our laws and traditions of religious freedom.

On another note, and just wondering, I see on the website of the Congressional Prayer Caucus that they are accepting donations they promise won't be used for legislative or political purposes. Apart from keeping up their snappy website, why would they need money to get together and pray?