Relativism and secularism are the product of the 60s cultural revolution (gone pop). It's all about liberation: from the taboos of the church, from any type of restraint or moral authority. The outcome is a relativism which sees all authority as culturally bound and equal in status or truth. There is no supreme authority above man. Hedonism and the selfish pursuit of the self are the rule of the day -- pursue your vices unimpeded.
I'm afraid it goes back a little farther than the 60s - about 5000 years further back.
You are wrong. They may have become very popular in the U.S. during the 60’s but they are NOT a product of it. These things had been brewing for along time.
Frankly, in my opinion, many of the philosophies and ideologies that were promulgated and glorified during the 60’s and even the 70’s have their roots in philosophies and worldviews that were on the scene even a hundred years before. Think of Blavatsky or check on Max Nordau’s bestseller of the 1890’s, “Degeneration.”
Most of this stuff is nothing more than Satan’s lies packaged and repackaged for each new generation; it’s the same old garbage however.
As for hedonism, that’s as old as man himself and so is the belief that man is the supreme being.