How often does the New Testament mention “demons” and “unclean spirits”?

If you track the actual New Testament terms behind Catholic translations (the Greek words that were translated), the counts come out something like this:

Demon and demons (Greek daimonion) is rendered sixty-three times.

Unclean spirits or spirits (Greek pneuma akatharton) appears twenty-one times.

So the total mentions tally to eighty-four.

In the New American Bible Revised Edition, which is the version commonly used in U.S, Catholic liturgies, the term Satan appears 18 times in the Old Testament and 35 times in the New Testament. The word devil appears roughly 36 times.

The exact English word-count can shift slightly from one Catholic-approved edition to another because translators occasionally render lines in different ways (especially in a couple of non-Gospel passages).

But the underlying New Testament usage—the “demon(s)” and “unclean spirit(s)” language—is essentially captured in the totals above.

Are they likewise captured in sermons/homilies?

Or is it rare to here mention (and warnings) of them?

In most churches, the latter applies: either due to a lack of clerical knowledge, fear, or concern that those in the pews would be bothered by it. Spiritual warfare has not, in the main, been a part of mainstream Catholic teaching nor is it commonly included in institutional religious media.

This is damaging: in the majority of Jesus’s healing, demons and/or unclean spirits were cast out. Do modernists believe Jesus was mistaken?

Unfortunately, many seem to think Jesus was superstitious (calling something demonic when it was actually “psychological”).

Fortunately, that pretentious (and basically heretical) viewpoint is changing.

The young swarming into the Church, as well as Evangelicalism, are clamoring to know more about evil, for a simple reason: they are seeing it all around them. And an increasing number of priests are beginning to take up the subject, instead of doing as has been done for many decades now: completely ignoring it in sermons despite Mass readings that mention such spirits.

Without losing the essential Good News that is Scripture, it would behoove all clergy to do the same.