Is 5 seconds of summer Catholic?

5 Seconds of Summer is a band, not a person, and bands don't have religious affiliations. The individual members of the band may have their own religious beliefs, but that doesn't necessarily reflect the band as a whole.

There's no public information available about the religious beliefs of the band members.

It's important to remember that people's religious beliefs are personal and private matters. We should respect their privacy and not speculate about their faith without their consent.