Which religion is dominant in Czechia?

Czechia is historically a Christian country, but is currently one of the most secular countries on Earth. According to the general census from year 2011, 10,3% of Czechs identifies with Catholicism, 0,9% with Protestantism, 2,7% with other religions, 6,7% defined themselves as believers, but didn't identify with any religion, and 79,4% stated they're irreligious or undeclared their beliefs. It is therefore the least religious European country.