Why would God need to send messages to people in Croatia?? Surely the message of God is for the whole world according to religion, so why do all these people walk around claiming 'He talked to us exclusively!'. Sounds like attention grabbing to be honest.
Still people have spend centuries predicting the End of the World over and over again, it was supposed to happen on 6/6/06 etc, I take it all with a pinch of salt.
Asteroids, Yellowstone Volcano etc I can understand, they are real threats, but not groups who claim to have had exclusive messages from deities.