The following category includes persons from Croatia who self-identify as members of the Roman Catholic Church (or if deceased adult, self-identified as a Catholic as an adult). Note Wikipedia's WP:BLPCAT policy: "Categories regarding religious beliefs and sexual orientation should not be used unless the subject has publicly self-identified with the belief or orientation in question; and the subject's beliefs or sexual orientation are relevant to their notable activities or public life, according to reliable published sources."
Also note WP:CAT/R which states the following: "Categories regarding religious beliefs of a living person should not be used unless the subject has publicly self-identified with the belief in question either through direct speech or through actions like serving in an official clerical position for the religion. For a dead person, there must be a verified consensus of reliable published sources that the description is appropriate.