@Frank Apisa,
Progressive revelation is a core teaching in the Bahá'í Faith and within the context of this teaching you will find my answer to your question. Progressive revelation(PR) suggests that religious truth is revealed by God progressively and cyclically over time through a series of divine Messengers, and that the teachings are tailored to suit the needs of the time and place of their appearance.
Thus, the Bahá'í teachings recognize the divine origin of several world religions as different stages in the history of one religion, while believing that the revelation of Bahá'u'lláh is the most recent and, therefore, the most relevant to modern society.
The basic concept of PR relates closely to Bahá'í views on God's essential unity, and the nature of prophets, termed Manifestations of God. It also ties into Bahá'í views of the purpose and nature of religion, laws, belief, culture and history. Hence revelation is seen as both progressive and continuous, and therefore never ceases.
Bahá'ís believe that religious teachings are of two varieties: essential spiritual truth, and ephemeral social constructs. The latter may include laws of conduct, diet, institutions, ceremonies, and treatment of criminals. These may change dramatically from messenger to messenger. The former, however, are essential and do not change, except perhaps in their cultural presentation. So the Manifestation of God is seen as at once restoring the essential truth, returning the faithful to the correct practice.
Simultaneously, the Manifestation eliminates redundant or corrupt social structures and creates such social organization as will support the improvement of mankind. For more go to this link:
http://en.wikipedia.org/wiki/Progressive_revelation_(Bah%C3%A1'%C3%AD)#Religious_truth_is_of_two_kinds