The Majjhima Nikaya is generally thought to be a fairly early Buddhist text, certainly well pre-Christ. Here I review what it has to say about faith.
Sutta 22, the Alagadduupama Sutta is a very significant sutta containing the rebuke of Arritha, the famous similes of the snake and the raft, the refutation of non-Buddhist views, and the teaching of non-self. It concludes with the final verse: "The Dhamma well proclaimed by me is clear, open, evident, and not patched together. According to this Dhamma - clear, open, evident, and not patched together - those who have faith in me, those who love me, are all on the way to heaven." This seems pretty clear.