??? You can't defeat an ideology.There are still communists and Nazis in this world.
Islam claims to be the final revelation of the same God that gave the tablets to Moses, and the same God who sent Jesus (though they claim Jesus is a prophet - not the Son of God). They claim that Islam is built on top of Judaism and Christianity - as though it is somehow the superior final word.
That said, they need to be forced to answer/explain how the ‘turn the other cheek’ teachings of Jesus are compatible with the violence of Islam. They need to answer why taqiyya (condoned lying) is compatible with ‘thou shall not give false witness). They need to explain why a loving God would condone the evil they've visited among others.
RE: ...You can’t defeat an ideology...
You’re right of course but we can minimize the threat substantially as Israel did in the 1948, 1967 and 1973 wars.
Iran’s territory used to be the site of a large contingent of Zoroastrians and some Jains. Not so much now (but a few remain).