What is the religion from Croatia?

Around 86% of Croats declare themselves as Roman Catholics which makes Croatia pretty much homogenic country, even though the number of true believers is less than half, the percentage is high only because of tradition.

However, if you wanted to know original religion from Croatian history - before converting to Christianity Croats had Slavic gods (http://en.wikipedia.org/wiki/Slavic_mythology) just like Nordian mythology, Greek mythology etc.