The single most foundational truth of the Christian faith is what the Bible refers to as the gospel; that is the good news of Jesus Christ. It is quite possibly the most overlooked part of our relationship to God, or lack there of, yet is absolutely the most essential aspect of knowing and connecting with Him.
Without the good news of Jesus the Bible has no validity. Without the good news of Jesus our faith is worthless. Without the good news of Jesus we have absolutely no hope of ever entering God's kingdom, learning His ways, knowing Him, going to heaven, or enjoying the life God intends for us to have. (1 Corinthians 15:12-28; 2 Thessalonians 1:5-12).