This is a curious sentence.
Of course it is.
You claim other historical accounts. What are they?
If you cannot answer the question, your claim is literally baseless.
Christian Apocrypha: The “Lost Gospels”? - Biblical Archaeology Society
If you can answer the question, then the books you identify are either in the Bible or excluded from it; there is nothing "alleged" about it.
http://sacred-texts.com/bib/index.htm
As for those identified accounts excluded from the Bible, on whose authority should they have been deemed Gospel and worthy of inclusion?
Exactly what I was asking.