Feuerbach was a well-known materialist philosopher in Germany, and his ideas mainly include the following parts:
Humanism: Feuerbach believed that the essence of man is a biological essence, and he saw man as a concrete, sensual material being, rather than an abstract spiritual being. He used people to replace the thinking of social people, and excluded the social nature of human thinking.
Naturalism: Feuerbach firmly believed that the natural world was the only real existence, and he advocated the replacement of theological and metaphysical abstractions with the natural world, which was a critique and refutation of the Hegelian idealism that was prevalent at the time.
Critique of Religion: Feuerbach explicitly pitted philosophy against religion in his writings, arguing that religion was the product of human reason bound by theology. In his works on the history of philosophy, he gave a positive evaluation of modern materialism and described the history of the development of philosophy as the process of the emancipation of human reason from theology.
The Concept of Death: In On Death and Immortality, Feuerbach criticized the concept of the immortality of the individual, arguing for the idea that "man is reabsorbed by nature after death", a radical idea that also had an impact on his standing in academia.
Materialism: Feuerbach was a staunch materialist philosopher, and his philosophical views had an important influence on the formation of Marxism. Although Marx criticized Feuerbach's old materialism in his Theses on Feuerbach, he also inherited and developed some of Feuerbach's views, forming the basic viewpoint of historical materialism.
In general, Feuerbach's ideas were multifaceted, and his theories had an important enlightening effect in those days, which had a profound impact on later philosophers, especially the formation of Marxism.