The foundational doctrines of evangelical Christianity include the authority of Scripture as God's inerrant word, salvation through faith in Jesus Christ alone, and the Trinity—one God in three persons. For our salvation to be valid, Jesus had to be both fully God and fully human, yet without sin. These core beliefs aren't just theological concepts but affect how we worship, live, and engage with others. Without a solid understanding of these fundamentals, believers can easily be led astray by false teachings that contradict authentic Christianity.