What if God, Reincarnation or the like did not actually exist?

How can humans possibly be any more destructive than they already are in the name of religion? Look to most of the wars being fought right now - most of them are over religion - and the total lack of compassion by the religious for those of other religions (check out the Islamic center 2 blocks from ground zero hatred). I have yet to meet an atheist who was intolerant or bigoted against others the way that religious people are. Most atheists are also humanists, meaning they place great importance upon the welfare of others. Besides, since atheists know this is the only life we get to live, don't you think they'd want to make it as worthwhile as possible? Causing destruction would not be logical. Also keep in mind that atheists tend to be better educated than believers, which is why 93% of members of the National Academy of Sciences do not believe in a personal god. These are not the kind of people who believe in destructive practices.

I never impose my religious beliefs onto others especially atheist and or antagonists, one thing I have noticed though is those who are athesists and or antagonists try really hard to disprove those with religious beliefs. Have a good day.

But you did impose by saying, "no one believing would make for a very destructive world." You assumed that those who don't believe in god would cause destruction. The facts disprove religions, atheists only try to make them more well known. Most atheists aren't okay with billions of people in this world deluding themselves with religion and the bigotry, hatred, and violence that these religions create. That is why they try to share logic with those who are religious. You have a good day as well :)