Whispers carry across the 700 seats of Spirit Square’s McGlohon Theater, the venue once known as a First Baptist Church sanctuary. With its Byzantine dome and stained glass windows, it hasn’t shed the shell of its former life. There’s another remnant from those years, too: Whether it’s Iron & Wine or Maria Bamford, every word or note penetrates in this space. It’s intimate, but somehow, seeing a show here will leave you feeling like part of an enraptured congregation.