Yes, there are unanswered questions but as far as an atheist is concerned, they do not attach any divinity to that. Sooner or later, the scientists will find an answer to that. Not too long ago, just a handful of scientists believed that the earth is round and it goes around the sun. But even a student of 3rd standard knows the fact.
Btw I do not have any quarrel with the believers. I know for sure that belief is like a crutch for them. But don't brings the go/gods on to the streets and auction them.
