Why are unbelievers so angry?

My Facebook wall is filled with the CRAZIEST posts imaginable. My husband jokes that we can't open my Facebook whenever kids are around from fear of having them exposed to some raunchy, angry, offensive, weird stuff!

But for the most part my wall is filled with 1 of 2 things:

Either obscene pictures 

or

Angry atheistic posts and photos

Now with regard to these angry atheist posts, I wonder where their adamance comes from? I had a friend once say, "You know, I don't believe in the tooth fairy, but I don't feel any compulsions to walk up to random children and yell in their faces 'THERE'S NO TOOTH FAIRY!!! ITS ALL MAKE BELIEVE. YOU ARE SUCH AN IDIOT FOR BELIEVING THE IN TOOTH FAIRY!!" 

So I don't believe in the tooth fairy, it doesn't stir up any strong feelings.

And really, he has a point. If you don't believe in God, then don't. Where does this anger and need to exclaim and constantly profess this unbelief come from? 

I have a theory, and it happens to come from my first hand experience living and marrying my husband who was an atheist when we met, and who is now a devout Christian.

Let me start off by saying that there are some atheists who are mostly scientific, who lost faith due to some inconsistency they found within the natural world and the word of God, but they don't usually express such anger.

But regarding my experience with my friends who have become atheists to the point of anger against God this is my theory:

They encompass a soul; so every fibre of their beings calls and yearns for the holy Spirit, but something has happened in their pasts that make them angry against God. It could have been a betrayal, abandonment, abuse, injustice, suffering, the list goes on. But something happened to them that they felt was so unfair and unloving that they became incensed! So through their anger they decided that a truly loving God must not exist because he allowed "______" to happen. 

They lash out at Christians and try to stump them with tough questions, such as "Well if Jesus is God, who did he pray to?" yadda yadda yadda.  They ask these questions, while on the surface hoping the Christian fumbles in his response so they can pounce and humiliate him, but under the surface, deep down in the very pit of their subconscious, they are yearning for an answer that makes sense. They are dying inside for someone to love them. And they get so FRUSTRATED when they receive fluffy sentimental answers, when what they really need is reason! They want this world to make sense.  

And it is because of this that we as Christians need to start taking our faith seriously--we need to mature in our faith and move on from sentimentality to science and reason. God created science and so really the evidence is stacked on our side. But we need to learn it. We need to arm ourselves with the truth so that when a hungry atheist is biting at our heals we have the bread of life with which to nourish him! 

Pick up a book on Christian apologetics like Dr. Craig's On Guard or Strobel's Case for Christ or Case for Faith. Read and learn. Fill your mind with the wonder of the LORD and then let your cup overflow into the lives of your neighbors, coworkers, friends, and unbelievers!