"CTS" is something of a misnomer - the group that used to call the Christian Theological Seminary home, which had the motto "Theater with a message" was actually Edyvean Repertory Theatre. Edyvean moved to a new home on Indy's near south side at the University of Indianapolis campus many years ago, where they had several more seasons before closing their doors permanently. Many theories were offered as to why the move eventually caused the closure - long-time patrons being unwilling to make the drive to U of I, the economy, the glut of community theater in Indy, and the inconvenience of parking on the U of I campus were common reasons people put forward, but it was probably a combination of these and more that did it. So unless there has been an announcement of the rebirth of Edyvean Repertory Theater, I don't think you'll get that particular feather in your cap, sad as that might be.
I have heard of a few productions that have been staged at the seminary - I believe they are affliliated with the school, however, and are not technically "community theater" anymore - however, I might be wrong in that assumption. Your best bet would be to contact the CTS office and ask about this to find out if they actually do theater where open auditions are held. (If I'm remembering correctly, one of the reasons Edyvean moved was that CTS wanted/needed their theater space for classes, seminars and other activities pertaining to the seminary.)
Next: VERY EXCITED to be in The Angel City 4, "City of Angels", Buck Creek Players, opening June 7.
"Never try to teach a pig to sing. It wastes your time and it annoys the pig." Robert Heinlein