“Hand to God” is headed to Broadway, but playwright Robert Askins isn’t quitting his day job yet.

The show, which starts at the Booth Theatre on March 14, had a cast party at Mexican cantina Lobo in Cobble Hill, where Askins is a barkeep.

“He spent the entire party mixing strong margaritas and shouting, ‘Support the arts! Tip your bartender!’ ” a guest said.

His show, directed by Moritz von Stuelpnagel, is about a “Christian Puppet Ministry” and a student who creates an irreverent puppet alter ego.

It officially opens on April 7.

(From left): Michael Oberholtzer, Geneva Carr, Marc Kudisch, Robert Askins, Moritz von Stuelpnagel, Steven Boyer and Sarah StilesGetty