Well, the first main cause of atheism is lack of evidence, but the second main cause is the Bible.
Based upon careful observation over a period of five years.
And as a fully committed atheist, this is what you know?
Atheism : disbelief or lack of belief in the existence of God or gods.
Why?
As you say, lack of evidence.
Improving methods of education over recent years, training people to actually, question, think and analyse rather than simply accepting what they were told to think.
The internet gives easy access to information that people are now more capable of analysing than ever.
Daily life knocks god belief out of many people, the unnecessary deaths and suffering that is prevalent in the world. Yes it always has been but the internet (see above) brings it to the attention of anyone with a cell phone.
Then of course, running a distant 5th is fundimentalism, i put it way down the list because it really only applies in small area's of the world, america and africa. Sure there are funnymentalists elsewhere but they are generally seen as oddballs who are welcome to get on with their beliefs but are otherwise not worthy of much notice.
Then comes the bible. I must say that the bible did play a small part in moulding my view after leaving the church i loved, but not as a reason i left. I used it as a reference work in an attempt to discover why many christians were so nasty and found the answers right there in the OT. Interestingly i had never noticed the hatred and bigotry the bible can teach to those susceptible to such teaching before i left the church.
