They are more likely to be Protestant. I've heard only 55% of Hispanics in Houston are Protestant, so there's your answer.
Well Houston does has always had somewhat of an evangelical presence, but I've always thought that the metroplex was far more fundie than the houston area. And Obama got around 70 percent in the heavily hispanic precincts in Dallas and Tarrant county.
Houston is more of a religiously diverse city than an evangelical one, it's suburbs however are a different story.
But I know Houston has been historically a haven for Protestant Hispanics, at one point 65% of the Hispanics in Houston were Protestant, it's rapidly increasing becoming more Catholic as years go by.
I dunno about much of the Metroplex since I have never lived there, but I've been told it's more religiously diverse than Houston.