If Jesus is real, why do Christian's say they believe in him. Shouldn't they say I know him?
How can one believe something they know?
The Gospel lays claim to a revelation of sin, righteousness, final judgment, atonement and you can know all that and still go on to perdition. Abraham was promised a son and he laughed, Sarah overheard the promise and she laughed. When Isaac was born he was named Isaac because it means 'she laughs'. Also, Abraham believed God and it was credited to him for righteousness, Sarah is said in Hebrews to have believed the one who made the promise if faithful. If by know Jesus, if you mean in a personal way I would agree wholeheartedly. The indwelling Holy Spirit makes known to us the things of Christ and is the only one who can truly convince you of the truth concerning Christ.
In the book of Acts it says the believing Pharisees were the ones pushing for circumcision. Sergius Paulus believed at the preaching of Paul after seeing Jewish sorcerer and false prophet called Bar-Jesus blinded. There are other examples, Agrippa believed at least the OT prophets but did he convert? I claim to know Christ, it's the heart of my Christian profession but does Christ confess before the Father that he knows me, that's the question:
“Not everyone who says to Me, ‘Lord, Lord,’ shall enter the kingdom of heaven, but he who does the will of My Father in heaven. Many will say to Me in that day, ‘Lord, Lord, have we not prophesied in Your name, cast out demons in Your name, and done many wonders in Your name?’ And then I will declare to them, ‘I never knew you; depart from Me, you who practice lawlessness!’ (Matthew 7:21-23)
I know of no instance where someone came to Jesus and he turned them away, there are repeated examples of them leaving him.
All that the Father giveth me shall come to me; and him that cometh to me I will in no wise cast out. (John 6:37)
Take my yoke upon you and learn from me, for I am gentle and humble in heart, and you will find rest for your souls. (Matt. 11:29)
Christianity isn't about religion, it's about a relationship. I can tell you all day long I know him but do I love those who love him, do I seek to know and do God's will, I can say I know him but does he know me in the sense of Matthew 7:21-23? That's a difficult question and we should never be so sure of our profession we fail to consider God gets the final decision here.
Grace and peace,
Mark