If Jesus came back would he know what Christianity is?

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YES - Jesus knows what Christianity, after all He set the guidelines for it.

and to the majority of those who call themselves Christian He would:

" And then will I profess unto them, I never knew you: depart from me, ye that work iniquity. " [Matthew 7:23]

The first complete manuscript of the bible was completed in 384, about 350 years after Jesus' execution. Soon after, all existing civil records of Jesus life were purged by order of Catholic Emperor Theodosius -- thus insuring the factual truth would never contradict the official Biblical version of His life. Considering that the Latin Bible was the propaganda/doctrine of the Roman Empire's last official religion, and Emperor Theodosius has insured the actual truth can never be known, Jesus would definitely not recognize the religion posthumously created in His name. Since Jesus was a practicing Jew, He would probably be outraged by what the Catholics and later Christians have done in His name.

I'm an atheist, but I have to point out that if Jesus could come back to life, then presumably he really would be a divine, or at least supernatural, being, and therefore he would probably know what Christianity was.

What he'd have to say about its modern incarnation is an interesting question.

Jesus is not gone, but He is in charge in Heaven and on earth. Of course He knows Christianity as it is the following of the discipline of Christ.

Yes, he would know that Christianity is brainwash!

The Catholic Church was the beginning of Christianity or it's mother as in Rev.17:5 Babylon the mother of whores!

Well that depends who you believe He is.

If you think he was a man with good stuff to say, then I think, yeah he'd be really surprised at what happened.

If, on the other hand, you believe Jesus is God, then you probably are cool with the idea that he's been watching everything all along, so, no, it obviously could not be a surprise for him, could it?

He wouldn't pay any attention, he'd be too busy playing Angry Birds.

Jesus is all knowing so yes He does know.

he would probably be like wtf is this sht, they preach hate not love. then probably smoke a joint

Here's what's going to happen when he comes back: Narrated Abu Huraira (r.a) that Muhammad (s.a.w) said:

The Hour will not be established until the Son of Mary (i.e. Jesus) descends amongst you as a just ruler, he will break the cross, kill the pigs, and abolish the Jizyah tax. Money will be in abundance so that nobody will accept it (as charitable gifts). (Sahih Bukhari, Vol. 3, Book 43, No. 656)