Humanism
Is, of course, our imagining ourselves as the supreme being. Even if we do not do this consciously, any denial of a Higher Power is an act of humanism. If we reject our need for God, we are saying that we "are good enough" all by ourselves. Why do we try so hard to hold onto the "I'm okay, you're okay" mentality when we should know better. Do any of us know anyone who is perfect? Do any of us feel ourselves to be free from flaws? Have we not - as humans - made a mess of history?
Our humanity - if it exists apart from God - is not something to embrace, but something from which we need Salvation. Not that we should be self-deprecating about our humanity if we look at it within the Godly model. After all, God values us as his most priceless creation. He sees us as royal children who need only to claim our birthright as the Prodigal Son did in that parable. Humanism is actually our selling ourselves short of that birthright. As such, humanism only gives the illusion of elevating us to preeminence. In reality, it is the act of living with a counterfeit. Worse, humanism is the ultimate delusion of grandeur, and a part of the definition of a fool.
Humanism's danger is that it misleads someone into thinking that they "do not have a need for God." It says that a belief in God - and in satan - is simplistic, unsophisticated, and outdated. Humanism supposes itself to place a greater emphasis on science over what it terms the "superstition" of religion. Yet the great scientists of history, of course, include God in their estimations.
Einstein said "Science without religion is lame; and God without religion is blind."
Of course, this should be natural and self-evident. Science and God are not mutually exclusive, of course. Science could well be defined as the methods by which God does all that He does. To rely on the shifting sand that science becomes when it stands alone is, in fact, pretty lame.
Ours is not the first humanistic century. the 1800's were, in fact, extremely humanistic. Even the Renaissance had what I would call a healthy dash of humanism - needed at the time to wrestle against the establishment that Catholic church had become. Our attitudes about God swing in cycles, with humanism leading inevitably to emptiness, which leads back to what Christians call revival. It is a fallacy to believe that we are on some linear track where we will eventually "evolve" away from God. We will see the cycle turn again....and we always will.
The most extreme example of humanism is satanism. Satanists call themselves humanists first and do not necessarily think of themselves as "devil worshipers," per se. If you read the satanic bible, you will find that it revolves around the worship of our own ego, and that the supreme annual holiday is one's own birthday. Satan is content with this because he doesn't care whether or not we believe in him. He only wants to make sure that we die separated from God, because his anger at God leads him to wish to hurt God. The best way he can do this is to keep us from God - because we are God's first love. Satan, of course, is powerless against God so, like a common bully, he turns his attention to us and cowardly works on the human side of the God-man relationship.
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