Why is the only "answer to Islam" empowering Christianity?

Because it's the only true worldview and the most effective counter? Athiesm cowers to islam.

the breeding cult

Doesn't exist. There are SOME "breeding cults" but they're rare.

Christianity will only grow if something more malevolent or controlling than it is

because it is 0% malvolent.

rises up.

Like the current rebellious satanic elites today.

They would absolutely love a rise of Islam, because it would result in people aligning with Christianity against it.

What a petty and shortsighted view. Not everyone is as selfish and myopic as you seem to be.