Terrorist,
Say, say you,
Who has made you turn
Into a terrorist,
...
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I am a poet and I am not a terrorist but to answer your question, feels like becoming a terrorist for killing all terrorists but yet I feel I may not answer your question.
I believe there is no religion orders the followers to kill, but there some idiots who kill others under the name of a religion. That's why when you want to know the reality of any religion, we should not look at the behavior of it's followers, but we should read and understand the book of that religion well, to know exactly what really the rules of that religion are.