He proposed a new religion, Evolutionary Humanism. The evolutionary process was to tell us what kind of society we should create. That idea didn't catch on. But even today, a few popular writers still try to explain everything we do by natural selection. But there's also a quite opposite attitude.
Some people find the idea of natural selection repellent.
But not for religious reasons. They say that it makes us helpless puppets, with no wills of our own. All this makes difficulties for biologists. And worse difficulties for the media. Lamarck was born in the middle of the 18th century.