Why do you believe?

[Jackalope]

Nobody knows who wrote the gosples? Are you serious? Better yet where's your evidence for such claims? Lol is this a joke?

You are obviously well-aware of church tradition but woefully ignorant of biblical scholarship.

Wikipedia is a good starting point.

http://en.wikipedia.org/wiki/Gospel_of_Matthew

Matthew probably originated in a Jewish-Christian community in Roman Syria towards the end of the first century A.D.[1] The anonymous author drew three main sources, including the Gospel of Mark, the sayings collection known as the Q source, and material unique to his own community.[2] The narrative tells how Israel's Messiah, having been rejected by Israel (i.e., God's chosen people), withdrew into the circle of his disciples, passed judgment on those who had rejected him (so that "Israel" becomes the non-believing "Jews"), and finally sent the disciples instead to the gentiles[3]

http://en.wikipedia.org/wiki/Gospel_of_Luke

Although the Gospel survives in anonymous form, it is considered that the name was known to the addressee, Theophilus.[36] The author was probably a Gentile Christian.[20] Whoever the author was, he was highly educated, well traveled, well connected, and extremely widely read.

http://en.wikipedia.org/wiki/Gospel_of_Mark

The Gospel According to Mark does not name its author.[2] A tradition evident in the 2nd century ascribes it to Mark the Evangelist (also known as John Mark), the companion of Peter,[8] on whose memories it is supposedly based.[1][9][10][11] However, according to the majority view the author is unknown, the author's use of varied sources telling against the traditional account.[12][13]

http://en.wikipedia.org/wiki/Gospel_of_John

The Gospel According to John (Greek τὸ κατὰ Ἰωάννην εὐαγγέλιον), commonly referred to as the Gospel of John or simply John[1]
[...]
Footnote 1: ^ Notwithstanding the name, it is an anonymous gospel

So no, this is not a joke.