WASHINGTON (CBSDC) — Former Massachusetts lawmaker Barney Frank revealed that he doesn’t believe in God.

During Friday’s appearance on HBO’s “Real Time With Bill Maher,” Frank, who championed the decriminalization of pot while serving in the House of Representatives, admitted to smoking marijuana and being an atheist.

“You were in a fairly safe district. You were not one of those congress people who would have to worry about every little thing,” Maher said to Frank. “You could come on this show and sit next to a pot-smoking atheist and it wouldn’t bother you.”

The 73-year-old Frank shot back, “Which pot-smoking atheist are you talking about here?” drawing applause from the crowd.

Frank, who has felt liberated since leaving Congress, said if he was appointed to fill John Kerry’s Senate seat, he would’ve taken the oath on the Constitution, not the Bible.

“I’d ask my governor to appoint me to the open Senate seat and he decided not to,” Frank said. “And I was looking forward to having my husband Jim [Ready] hold the Constitution, not the Bible, and affirm, not swear, that I was going to be a wonderful senator.”

Gov. Deval Patrick appointed Mo Cowan to fill Kerry’s Senate seat after he replaced Hillary Clinton as President Barack Obama’s secretary of state.

Frank, who announced he was gay in 1987, served in the House from 1981 until retiring when his 16th term ended in January 2013. He married Ready last year.