Evangelism
(Not the free software kind.) The streets between here and the 24th Street BART station are fairly covered with evangelical Christian literature, some in Spanish, some in English, including Jack Chick cartoons. I saw a notice about how there was going to be a "campaign" in honor of Holy Week, so probably I'm just seeing some of the advance publicity work.
The Mission and the South of Market are really different in visible ways, like what kinds of things typically happen in public. In the South of Market, I've never seen anyone engaged in any kind of religious proselytizing or debate (or a house of worship, except the church across from the Metreon). In the Mission, religion and religious evangelism are relatively large, active forces. (Biella, approximately: "There's a reason it's called the Mission District...")