ehm Fasching is like Carneval some hidnic ritual I think.
We`re not VERY CATHOLIC. Maybe the city where you live, but I lived in 3 citys since I was born, and well except a girl I knew in primary scool I don't anyone who really cares about religion.
Here in LInz fasching isn't very popular, it`s just a reason to eat lot`s of Krapfen and drink far too much, and well if you want to , wear really strange clothes