**_Dealing with a death-worshipping, revenge-seeking Mexican cult_** After his 11 years-old daughter (Chloë Grace Moretz) goes missing near the Texas border, an American man (Simon Baker) ventures deep into the sleazy side of Mexico to find her, with many secrets revealed in the process. Paz Vega is on hand as his wife. “Not Forgotten” (2009) is basically a mixture of “The Flock” and “Borderland,” both worthwhile films from two years earlier. While it starts well enough, the second half unfortunately bogs down into a tedious, repellent, ludicrous mess. Did I mention ludicrous? The…