Since Catholics make up the largest religious denomination in the U.S. (69.5 million members, which is 22% of the population), it makes sense that their political leanings would be close to the average among Americans of all and no religious affiliations.
Still, since in the media there is a tendency to associate religious with right-wing, it’s worth noting that Catholics lean Democratic rather than Republican — 44% vs. 37% — by exactly the same proportions as do all U.S. adults.
Pew Research breaks down the numbers for all religious groups: