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It is true that the Apocrypha and Gnostic Gospels were excluded from the Bible. However, it does not follow that the Bible is a human construct. The question is why they were rejected. Broadly, there are different reasons why people reject certain books. It may be that these books do not reflect reality. For example, the Chinese reject a popular Japanese history book that glosses over the atrocities committed by the Japanese during the second world war. Or consider the time when certain authors published books that suggested that the holocaust did not happen, invoking public outcry. Rejection of books, hence does not equate to those doing constructing an alternate reality. They are simply rejecting the books because the claims of these books were inconsistent or untrue.

The Jews and the early Church rejected the Apocrypha as Scripture on grounds of inconsistency and inaccuracy. For more information, check out http://carm.org/why-apocrypha-not-in-bible. Similarly, the Gnostic gospels were rejected because they were widely recognized as late, post first-century works written by Gnostics and not by the eye-witnesses of Jesus and their close companions. For a good discussion on the Gnostic gospels, see
http://www.bethinking.org/bible-jesus/intermediate/the-gospel-of-judas.htm.