How do we know Jesus' kingdom is true?

The truth of Jesus' kingdom is evidenced by his resurrection from the dead, which showcased his authority over life and death, fulfilling the prophecies in Scripture. As stated in Mark 1:15, Jesus preached the coming of the kingdom of God, urging people to repent and believe the gospel. This call to repentance and faith underscores the transformative power of his kingdom, where sinners are brought from death to life through grace. Furthermore, the lasting impact of his kingdom on believers' lives and the historic truth of his life, death, and resurrection solidify the reality of his reign, which endures beyond this present age.