we cannot ignore the fact that when christianity was incorporated into the roman empire, pagan rituals and beliefs were incorporated also.. for example.. dec 25 is not the real birth of christ.. almost all christians knows that as a fact.. or the observance of all souls day, the holy week, and other supposed christian traditions.. it doesnt matter anyway because what is important is the essence of worshipping your GOD..
the earliest concept of GOD in the old testament is somewhat similar to the mesapotamian god MITHRA or the sun GOD.. before the teachings of christ could be put into paper, concepts from other religion had already assimilated into christianity.. for example of this would be islam.. there are many christian beliefs that are found present in the teachings of Islam.. its also note worthy that the great prophet himself spent time with early christians..
and also, due to oral tradition, many things have been changed from the original.. oral as in tsismis bah..
we can never say that the christian doctrine is an original.. just as Islam had roots from christianity, christianity came from judaism.. and judaism comes from another ancient religion which is probably long forgotten now coz the mesopotamians got their a*sess kicked by foreign invaders who brought along their own religion..
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have you noticed about saints? naa saint of fertility, success, or whatever, even worship the image of mary plus her many variations and the sto. nino.. catholics attribute certain traits to certain saints.. isnt kind of like the roman/greek belief to attribte different personalities to different Gods?