A prominent advocate for the irreligious says there are at least 30 “closeted” members of Congress who don’t believe in God, and that he hopes a California congressman’s Thursday admission of disbelief will encourage others to come forward.

The advocate, an advisory board member of the Secular Coalition for America, has for more than a decade plied private admissions of atheism from members of Congress with the promise of confidentiality, and said Rep. Jared Huffman, D-Calif., is in good company.