Justin the Martyr also wrote that the Logos came to some of the Greek Philosphers as a sort of "proto-evangelium" in their thought on the Logos. But if you go to Romans and back up a few chapters, you'll find that God has written in ALL men's hearts a natural law. This Law, no doubt, is the Law that Christ gave His Apostles - to Love.
Those who love as God intended for men abide in Christ ... that is the ultimate definition of a Christian - to abide in Christ. Thus, a person who follows the Law of Love as written in their hearts is abiding in Christ (the Logos before His incarnation), even before the Birth of Jesus. This much is clear. No one can please God except through faith - which comes from God. The OT is full of people who were pleasing to God - and thus had faith. Christianity is not a new invention, but a fulfillment of EVERYTHING good that God has revealed to man, whether it is Judaism, or whether it is in the heart of a man in the Amazon jungle.
Hats off to ya!
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Regards