Why religious people always think that atheist deny existence of god but in deep heart they accept god? And to the person who posted it :- Anything that exist, has evidence of its existence. Because if any force or matter somehow affect this physical world, it is fairly impossible to remain anonymous. Most of the arguments Christians has been telling since centuries have been proven wrong. Like Earth is flat, earth is center of the cosmos, world is about 6000 years old etc. So now there is no sense in believing you until you offer evidence or at least strong and logical argument to support your idea. If you think we will believe because you say so, and it is written on bible, having this hope is highly illogical (At least in case of me). By the way, the uncomfortable feeling you are having after knowing views of atheist is known as 'Cognitive dissonance'.
Atheism has become more popular in the last couple of decades then non-theist belief has since the beginning of organised religion started. And I believe the internet has a strong role to play in that. The spread of information, the openness of community, like mindedness and not being pinned downed by whatever is happening in your local area is what has lead to this.
Its like here in my town, they only have a small gay community here and those in that community I never had much to do with, little in common, no interests shared, and was generally hard to make any lasting friendships (the only person who I was friends with died because of an hereditary disease) but I never got anything out of being in my local community.
Online however, I began to meet like minded people, make real friends who despite being across the country and even in other countries, have become my friends who share in the things I enjoy too, so I'm not hampered by my local community anymore.
The same goes for the spread of information to do with atheism, decades ago, a man couldn't walk around in his local town and say he didn't believe in god, he'd be seen as an outcast, especially in church going communities where the church is the center of everything. Its also a case said man would likely be in the same position I was in, having nothing in common with all the bible kissing theists around him, yet now because of the net, theres a reach for people who like mindedness who don't have to be afraid of expressing there truth beliefs.