being self-contradictory, then others can use your spears to attack your shield, and this theory is difficult to be accepted. The reason why contemporary people lost their faith is because all existing philosophical and religious theories cannot be justified. There are two types of beliefs: rational beliefs and irrational beliefs. All kinds of religions are irrational beliefs, rational beliefs are also called secular beliefs, and the beliefs of most political parties are rational beliefs. Every party's belief are different, and many individuals also have their own unique beliefs. However, most of these beliefs are unsystematic, disorganized, superficial, and self-contradictory. Therefore, their ability to guide practice is poor and there are not many believers. Marxism and democracy are the two most influential secular beliefs in the world. Political belief and philosophical belief are the core content of beliefs. Political belief must also be based on philosophy. Political theory cannot be justified without philosophy.

The Renaissance campaign defeated religion by science. Science destroyed all the theoretical foundations of religion, but then science experienced crises repeatedly. Philosophy is part of science and provides the basis for science. Religion can still have many believers because philosophy cannot justify itself. Good philosophical theory must be able to justify itself and eliminate all kinds of logical contradictions. Such philosophy can provide people with a firm belief.

Ancient Chinese and Western philosophy contained a lot of wisdom, but today it looks very rough. After the Renaissance, modern western philosophy developed rapidly and gradually formed a system. Marxism is also part of western modern philosophy. However, all of these philoso- phical theories have many fatal flaws. There are many basic problems that cannot be resolved for a long time. Marxism is criticized a lot, and contemporary western philosophy is hardly better. Contemporary European philosophy and American philosophy is more