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I don't really know much about religion ....
Both Christians and muslims have some sensible core tenets....
But really killing people is not the answer.
I've taken the liberty of summarizing your comments. Look at the logical puzzle you have presented.
The solution to it is to reverse the bolded statement.
No, they do not have the same sensible core tenets.
If they did, Muslim leaders would widely and openly condemn such brutality and senseless killings as what has recently happened in France.
But they don't.