I have never met an antitheist who did not mean to offend. Offending is what differentiates them from atheists.
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As rule most religions depend on miracles and illogical events for their justification. This is why nonbelievers are drawn to disbelieve.
Take the Doctrine of Original Sin:
We are all sinful by nature because an ancient ancestor took poor culinary advice from a talking snake. Therefore, we need to accept what was allegedly said by a Son of God, born of a virgin and written down 70 years after his death, and engage in weekly ritual cannibalism to confirm our belief.
That is the core of Christian belief. It clearly defies logic. Saying this offends those who dislike being accused of believing illogical nonsense.
There are surely better reasons to endeavor to lead a moral life that does not require talking reptiles, magical fruit, a virgin birth and ritual cannibalism .
The atheist simply says, "I reject this as illogical." Most atheists do not bother to even say this publicly. Some Jews ridicule Christians (read what Maimonides said about Jesus), Some Christians and Muslims ridicule one another.
Otherwise, all they can say it "our magic and miracles are true, yours are not".
Human beings are at their best when they think logically about most of our endeavors, but when it comes to religion, a lot of people are stuck in the Middle Ages.
