Gotta agree with Cymric here. Religion by its nature is based on faith, and faith can be very, very blind. Science is based on reason on logic, and these are the best tools for mankind to probe the world around him. Faith itself is useless except as a comfort. At its worst, it can stifle the human spirit as much as any tyrant.
I still hold this: religion is one continuous assault on the human ability to reason. Like sacrificing babies for a good harvest and worshipping trees, it must be removed for progress.