“Because if you confess with your mouth that Jesus is Lord and believe in your heart that God raised him from the dead, you will be saved.” Romans 10:9
This verse is simple enough, but why should you believe that God raised Jesus from the dead? Even more importantly, why should I believe that Jesus died on the cross for my sins? How can I believe that Jesus is God? We are taught that we must have faith, but our faith is not blind and based on nothing factual. God has provided reasons to believe in the Bible, which are supported by history, science, and reason.
If Christianity is real, then every Christian should be able to answer the question: Why do you believe?