How can you know God?
It all starts with accepting Jesus Christ as your Lord and Savior. Jesus Christ provides a relationship with the Father and eternal life through His death on the cross and resurrection,
This is funny given that while on the cross, Jesus spoke like he doesn't know God when he cried out "my God, my God, why has thou forsaken me". No person of God would ever question the actions of God for doing so indicates a gross lack of faith.