There are many reasons I think that people should abandon their beliefs in the supernatural, but if that happens, you must deal with where to go next.
Atheism is defined as the disbelief or lack of belief in the existence of God or gods, but it has gone under revisions in the public realm. Atheism is now often equated with angry brooding in dark rooms, screaming at god, and being a smart-ass to anyone/everyone that you come across.
This is a development that has been dissipating as atheism is becoming more prevalent. More and more people are starting to realize that atheists are people just like themselves. We simply have come to a different conclusion regarding the nature of existence.