If "Satan is a master deceiver, and has filled the lives of well-meaning, professing Christians with idolatry," then perhaps the readers of this tract shouldn't have too much trouble concluding that a great number of members of this site are unwitting idolaters. Would you agree?
(I'm not saying that the conclusion would be untrue because it is distasteful; I am saying that if I believed that I was on a forum full of idolaters, my posting behavior would be rather interesting.)
Yes, they are, unwittingly. It's not that they're bad people. It is so entrenched in our culture, it's almost unavoidable. It takes a certain kind of person with a questioning, focused mind to see the truth for what it is, and your influences have to be enlightened to the facts; else you will never understand the complex path that has led to modern feel-good, corrupted Christianity. It's not something we discover in a vacuum.
What does it take for people to change? We see modern churches endorsing homosexuality, approving of punitive wealth redistribution, espousing Marxist creed, and refusing to condemn abortion. These are all atrocities against scripture, against Judaism and Christianity that should be obvious to all -- except it isn't. They don't want to alienate anyone! After all, these churches need the membership! They need the money, so they can add another building to the church grounds, or build a bigger auditorium, etc., etc. How much worse is it going to get?
We are seeing an erosion of culture that is going to end badly. It's tragic enough that external forces are imposing on those of us with faith (secularism). But when we give in, when we no longer set our selves apart from the secular humanists, we will meet a fate much worse; we will lose favor in the eyes of God.