How do we know when the Gospels were written?

I looked at several in the list as I didn't believe that anyone would actually omit passages. Its true however, and since I am told often that it is infallible I am quite shocked that anyone would literaly remove passages from the bible.

Its sad really when you realize how limited your knowledge of a subject really is. I don't claim to be a bible expert, but I had the understanding from school and various conversations that the council of Nicea was essentially to decide how to interpret various passages of the bible. Its facinating to see that the various versions do not just change wording but people actually sat down and decided what they would and would not include.Equinox, Nasr Allah, and Archer Opterix have shown that I know virtually zero about the progression of the bible. I thank all of you for possibly ruining months of my time trying to understand how things came about. Too many topics to cover and not enough days in the week.I plan to copy/paste all of your posts and hope to be able to give them the time they deserve!