I am an agnostic and religion plays no role in my life.
This does not prevent me from being able to read plain English.
The government can't create a state religion. They can't make me adhere to any particular religion. They can't tell me that I CAN'T adhere to any particular religion. They can't penalize me for having NO religion.
If a city hall somewhere puts a Nativity Scene on the lawn, no LAW has been passed respecting an establishment of religion. A law either requires action or prohibits it. The presence of a Nativity scene does neither. It doesn't harm me, nor does it offend me. It has no effect upon my quality of life. It in no way interferes with my civil rights.
If some judge chooses to put a plaque of the Ten Commandments in his courtroom the situation is the same: no LAW has been passed respecting an establishment of religion. It's no skin off my nose.
What's so damned complicated about this?
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