Blacks in the Scriptures: Marvin Perkins December 3, 2012April 12, 2014 sistasinzion Sistas in Zion Radio! Every Sunday 5:00 p.m. – 7:00 p.m. (Mountain Time) Listen here. Mobile iOS users listen here. Call in at (646) 478-3671. Tune in as the Sistas chat with Marvin Perkins, co-creator of the Blacks in the Scriptures series.