You can see the difference when the subject actually comes in a conversation. When you say your atheist, no one questions you, it seems only natural. But when you say you are christian, instantly the questions and objections come. (Again, this is in very secular culture in a scientific environment)
This is exactly the same situation in the UK outside ethnic groups, both in academia and the wider community. Atheism requires no more apology, and probably less, than a nominal adherence to Christianity. Evangelical Christianity is growing, but it is still very much a minority and regarded with suspicion.
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