Vanderhoven,
The easy answer to your questions is simply that there are no names written on the original manuscripts. In later manuscripts scribes (slaves) would have attributed whatever gospel account to people who they felt were in close proximity to Jesus, perhaps based off stories said to originate with the apostles, but later in the century. Paul had already written Galatians and 1&2 Thessalonians + before Mark was written, so that gives you the time line where those close to Jesus would have been of considerable age or dead. As most people were not literate (especially in formal Greek), these stories remained word-of-mouth for many years. Matthew and Luke use Mark as one of their sources. NONE of these were eyewitness accounts. AND whoever wrote Luke also wrote Acts quite possibly as one book.
But with manuscripts of the time, many books did not have names. Paul's letters have specific congretations but books not written by Paul like Ephesians do not have "Ephesians" in the title. It says "Letter to the ____." Some manuscripts have another name written in. This meant it was a circulated letter, not something Paul did. Same with the gospels, they were nameless and circulated.
The gospels were not "made up." There were many miracle workers at the time... that was not odd. There were many apocalyptic prophets... also not new. But Jesus was popular as he lead his group and the group of his predecessor, John. So books can be written about miracle workers... no big deal. However, those that believed the Christ was the Messiah ran into a problem... he DIED. Now this goes into the whole concept of Jews and the resurrection that I will skip and say people told stories based off what they thought they saw at that time. It isn't made up... it's just not necessarly REAL.
People today can apply the stories however they want. Just because it's inspiring literature doesn't mean it's LITERAL literature. This somewhat Protestant approach of asking over-simplistic questions as if in disbelief does not favor LEARNING. The bible is a dense subject and there is A LOT of criss-cross information to come to just one conclusion. But if even the most common of knowledge is foreign to you, you might consider putting in some effort of your own and taking a (secular) class on the subject rather than rattling hard-earned knowledge out of others.
There is WAY too much about the fundamentals of bible history you do not know to answer the questions you are asking.