Why do JWs claim to not celebrate Christmas or birthdays, but will accept gifts?
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Because Christmas originates from the celebration Saturnalia, which was a celebration to the Roman god Saturn. Birthdays originate from the Roman religion Mithraism.
Merely accepting gifts is just that, accepting gifts. But participating in those two things is different because they originate with Roman religions to Roman gods.
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Haven't there been a great deal of false prophecies by the WTS? Why don't these fasle prophecies seem to alarm or repel any of JWs? Do they not notice, or not care?
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A prophecy would be making a prophecy about the future. Which witnesses have not done.
What Witnesses have done is try to interpret what Jesus meant by 'this generation will by no means pass'. Those words were already there, the gentiles times were already written about as well. Witnesses themselves made no prophecies, just attempts at interpreting what was meant by 'this generation', as in 'does it mean the generation born in 1914'?