Unfortunately, Satan doesn’t play by man-made rules. The Bible warns us that demonic activity will increase before Christ returns. So while I generally agree with you that one must invite Satan in through word or deed, I reject the idea that Satan is typically seductive rather than aggressive. A lion seeking to devour is not seductive.
Oh I believe the enemy of mens souls is very aggressive...in all his ways. “He knows that his time is short.”
I agree also that demonic activity will increase more and more....but it will always be in whatever ‘form or design of’ that people are already ‘prepared’ to accept...Individually and also as groups.
People tend to gravitate to others as themselves....UFO New Agers are a good example of this today. It’s a hodge podge of anything and everything with just enough ‘God speak” to entice the willing...and there are many. They use Christian terminolgy frequently.
I do believe if a Christian is not in Gods Word how can he know what is false if he doesn’t know the real thing?