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The reason I ask is because nothing seems more like religion to me than the American left.

That's pretty scary but not surprising. You may recall Joseph Ratzinger, the predecessor of Pope Francis, addressed this issue, from a christian perspective, in the homily he delivered at the mass that preceded his election as Pope Benedict XVI. His words have haunted me ever since he delivered them 11 years ago and will definitely clarify what you are expressing.

How many winds of doctrine have we known in recent decades, how many ideological currents, how many ways of thinking. The small boat of the thought of many Christians has often been tossed about by these waves - flung from one extreme to another: from Marxism to liberalism, even to libertinism; from collectivism to radical individualism; from atheism to a vague religious mysticism; from agnosticism to syncretism and so forth. Every day new sects spring up, and what St Paul says about human deception and the trickery that strives to entice people into error (cf. Eph 4: 14) comes true.
Today, having a clear faith based on the Creed of the Church is often labeled as fundamentalism. Whereas relativism, that is, letting oneself be "tossed here and there, carried about by every wind of doctrine", seems the only attitude that can cope with modern times. We are building a dictatorship of relativism that does not recognize anything as definitive and whose ultimate goal consists solely of one's own ego and desires.
We, however, have a different goal: the Son of God, the true man. He is the measure of true humanism. An "adult" faith is not a faith that follows the trends of fashion and the latest novelty; a mature adult faith is deeply rooted in friendship with Christ. It is this friendship that opens us up to all that is good and gives us a criterion by which to distinguish the true from the false, and deceipt from truth.

Don't be deluded by liberalism. It is like the vortex of a tornado that sucks you in.