Is atheism a scientific perspective?

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I think what people would call hard atheism is unscientific.
People who claim to know there is no God which is basically claiming knowledge about something that isn't testable.
In general practical terms though most atheists just reject religion. And since the mainstream religions make unscientific claims then the absence of belief in those claims could give someone a scientific advantage.

I see your point. While I agree that religions make unscientific claims, I think that the prediction of design that comes from the religious worldview has been scientifically productive; especially in biology.