EPHESIANS 2:20

"Consequently, you are no longer foreigners and strangers, but fellow citizens with God’s people and also members of his household, built on the foundation of the apostles and prophets, with Christ Jesus himself as the chief cornerstone"

As the central figure in Christianity, the final argument for Christianity lies with Him. Jesus is the cornerstone which determines whether Christianity stands or falls.

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For more on who Jesus really is we recommend the following books by Lee Strobel, an atheist turned Christian.