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It is not racist to challenge religion (I would encourage everyone to do so).
Do you encourage them, in the process, to use childishly insulting wording designed to appeal to racists? Your choice of username and icon suggests you might.
The choice of imagery is important in communication, whether it's comparing a woman to a letter box or choosing the name and image of elite WWII German troops as your representation.
It is not racist to challenge religion (I would encourage everyone to do so).
Wearing a Burka (out of choice or otherwise) should not be normalised. It should not be offensive to point this out.