I am an Atheist because religion is a get-out-of-responsibility-free card.
“My (cleric) told me to do it.” “god wants me to do it.” “(my book of myths) says so.”
This is an excuse for every kind of laziness, abuse, crime and hatefulness. Their rules not only encourage them to ignore and break society’s rules, their rules give them a pass on breaking their own rules. Repent, beg forgiveness, and go back to doing to same thing again while loudly condemning anyone who acts like a human being and takes responsibility for their actions.
I am an Atheist because religion moronifies and roboticizes the population. Democracy is impossible when the majority of voters follow clerical orders without thought – when the majority of voters are so trained to unquestioning obedience to authority that they are incapable of independent thought.
I am an Atheist because religion obstructs human progress. Religion is fundamentally reactionary and hidebound, and can only survive in the absence of advances in science, community, morality and humanity. Conversely: science, community, morality and humanity advance only where religion is kept outside the wall of secular government protecting society from theocracy.
But it’s the responsibility-abdication of religion that makes atheism so attractive.