Why did some post-Communist countries see a rise in religious observance while others continued to drop?

by WorriedCivilian

It seems that nations like Poland and Romania saw a marked increase of those people are religious, but nations like the Czech Republic and Estonia have seen the opposite trend. Why?

Know_Your_Rites

The USSR only fell in 1990, and this sub's jurisdiction ends in mid '96. <6 years can't provide much data to go on.