No offense taken.. why would there be any? Good question.
The gospels were written with different purposes in mind, and by
people with different experiences, at different times.
A comparison of the different emphases:
http://catholic-resources.org/Bible/Jesus-Birth.htm
A guide to the backgrounds and purposes of the 4 Gospels:
Matthew: http://www.catholic.com/thisrock/1992/9207ntg.asp
Mark: http://www.catholic.com/thisrock/1994/9411ntg.asp
Luke: http://www.catholic.com/thisrock/1994/9403ntg.asp
John: http://www.catholic.com/thisrock/1993/9309ntg.asp