Here is a pic from St Michael's with the same fancy brickwork
Well, if it is real, all to the good, and I shall stand corrected. Just from the picture, though, it reminded me either of Baltimore Formstone or that cheap textured contact stuff. Or it could actually be old, timeworn brick work.
Being in eastern Pennsylvania, in an area populated from colonial times, it is entirely possible that it is, indeed, some old historical church, with some kind of weatherboarding put over the brick. Looking at the immediate neighborhood on Google Street View, it does appear to be quite an old area. (And one of the houses has a Confederate flag on the porch.)