55% of Hispanics in America identified as Catholic in 2013. The number declines by about 5% per year. Among Mexicans (the main bloc of illegal aliens, and the least conservative), fewer than half identify as actual practicing Catholics.
http://www.pewresearch.org/fact-tank/2014/05/07/fewer-hispanics-are-catholic-so-how-can-more-catholics-be-hispanic/
Huh?