---There is good reason why people are blaspheming on Youtube videos. Just as you believe in your god and devil, others believe in their gods and devils, and Atheists believe in none of the above. You put this video up to try and help people, leading them to your god. Others are also trying to help people by leading them away. Not believing a god exists, Atheists are trying to keep others from falling prey to those who would use your faith against you.
We do not believe in heaven or an afterlife, since there is no proof to that effect. We want people to live their lives the best way they can. We want people to live, love, and enjoy life. We want people to not hate others because they believe something different than them. We want this because we believe that this is the only life we are given, and if it is wasted, there is no second chance.