What are the philosophical beliefs of secular humanism?

from the old testament

• The Old Testament consistently teaches that truth and wisdom come from God’s revealed Word, not from human perception (Deuteronomy 8:3; Psalm 119:105).
• Human understanding is limited and can lead us astray if it replaces trust in God (Proverbs 3:5–6; Jeremiah 17:9).
• We must seek God’s wisdom above all else, recognizing Him as the ultimate source of truth (Proverbs 2:6; Ecclesiastes 12:13).

from the new testament

• Secular humanism is partly a reaction to the existence of superstition and irrationality in religion. Christians are not opposed to reason. In fact, believers are commanded to "test everything" and "hold fast what is good" (1 Thessalonians 5:21).
• The Bereans were a good example of right Christian conduct in regard to information—they compared what Paul told them to the Scriptures, to see if it was correct, investigating the facts they had been given (Acts 17:11).
• Christians do not condone ignorance or blind belief. But every idea we encounter is to be tested against the standard of truth that is God's Word (2 Corinthians 10:5). We do not want to be ruled by superstitious nonsense and false ideas, and clearly God does not want this for His creatures.
• The difference between Christian thought and secular humanism is that Christians believe the answers to life’s questions are found in Scripture (2 Timothy 3:16–17), while secular humanism teaches people to rely on their senses and perceptions to discover truth (Colossians 2:8).
• The main message of Christianity is God's desire to save humanity through repentance and faith (John 3:16–18; 1:12). Secular humanism rejects this message and embraces the idea that humans can save themselves, heal the world, and eventually evolve beyond sin. This is a nice idea, in theory, but it will never happen. We simply do not have the power to accomplish our own salvation (Romans 3:10–12).

implications for today

Secular humanism is a branch of philosophy that grew out of late eighteenth / early nineteenth century Enlightenment thinking. It is also called Humanism. It embraces human reason, instead of religion or revelation, as primary in determining morality and ethics. It favors the rational over the metaphysical, and the natural over the supernatural, especially as a means of finding knowledge about mankind and the world around him. Secular humanism believes that humans are fully capable of being ethical and moral without the help of a deity. Furthermore, secular humanism claims that humans can achieve their own happiness. In fact, the mascot of the International Humanist and Ethical Union (IHEU) is called the "Happy Human."

Secular humanism seeks to explain humanity's existence without God, and like all false messages, sets humanity in God's place. For followers of Christ, there is a recognition that the human mind and will must submit to the mind and will of God—even when we cannot understand His ways (John 6:60–69).

Secular humanism does not offer a viable solution to humanity's dilemma of sin. Alexander Solzhenitsyn once said, "If humanism were right in declaring that man is born to be happy, he would not be born to die. Since his body is doomed to die, his task on earth evidently must be of a more spiritual nature." And C.S. Lewis once said, "Has this world been so kind to you that you should leave with regret? There are better things ahead than any we leave behind." This is very true. This world is riddled with disease and war and other ravages of sin, and it is not meant to last. Our mortal lives are temporary, but our souls are not—true happiness is waiting for us beyond this world, if we trust Christ to save us and bring us safely into His kingdom (Luke 23:42).