I didn't like it because it was unfair...they had to make a impossible decision.

But why exactly? Why does one family have to make a sacrifize? To satisfy "god"? But why, what was the motive ?

Btw I think it wouldn't have been much different if it was a SF movie where aliens demanded a sacrifize instead, it would need a motive.

The evidence was also pretty flimsy... footage could have been faked and maybe they did know about a storm coming.

I know movies don't always need to make sense and provide reasons why bad things happen, but personally I didn't like it.