How do we know that Christ is our only way to God?

In the sermon, it is highlighted that only one person has walked the earth perfectly and fulfilled the law: Jesus Christ. He lived a sinless life, meeting all the requirements of righteousness that Psalm 15 demands. The preacher emphasizes that while we, in our fallen state, cannot comply with God's law, Christ did so perfectly. His life, death, and resurrection not only secured our salvation but also ensure we can be united with Him as a new creation. This is a foundational belief in Reformed theology, asserting that salvation is entirely God’s work through Christ, and we, as believers, are saved only through faith in Him.