Q did NOT say aliens exist, he mocked those who suggested it.
He wasn't asked if aliens existed only if we are alone. There is an angelic/demonic realm that is very real. Molech and Minerva are real demonic beings who have been worshiped for centuries.
He answered how far is the nearest star, that is as good as saying, think about it stupid.
God said He would bring them back to their land. You can't beat God.