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It is a very good question to bear in mind. Let us for the sake of argument allow that there are spirits effective in the ordinary world of human experience, many if not most of which bear ill will towards human beings.
That granted, still the human being has to give them a niche to slink in through before they can do any real damage. From satan's point of view, he gets the best traction out of the perpetrators of the Seven Deadly Sins: Pride, envy, anger, sloth, greed, gluttony, and lust....
Add to that list: Spiritual pride (your recommendation); arrogance; narcissism; inordinate desire for anything that is not God....

Very engaging point. If the evil spirits could enter anyone without having "a way in," newborns would be particularly at risk since they would be a blank slate wrt faith.

In God alone is the Logos, Truth -- thus final authority in this world and the next.

All praise and glory be to His Holy Names!

Amen! Praise God!