There is an weird sort of parallel between many atheists and theologically liberal Christians: Making up a false version of God. The difference, of course, is that one group doesn’t believe in their false version and the other does believe in their false version. But the end result is the same: Self-worship, or making up your own version of the universe.
Many atheists mischaracterize the God of the Bible, such that they don’t believe in a god that doesn’t exist.
Many theologically liberal Christians mischaracterize the God of the Bible and believe in a god that doesn’t exist.
Both groups take things out of context and only read the parts that (they think) support their views.
With the atheists it is a classic case of asking about the god they don’t believe in and then responding, “Oh, I don’t believe in that god, either. I believe in the one who revealed himself in the Bible.”
With the liberal Christians it is simply a form of idolatry. They have made a god in their image that agrees with them and comforts them, but it isn’t the true God. They disagree with Jesus over and over on important issues and either don’t notice it or it doesn’t bother them.