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Faith (saddhā / śraddhā) is an important constituent element of the teachings of the Buddha (...) It betokens faith in the reliability of the Buddha as a truly Awakened guide and confident trust in the truth of the Buddha's teachings (his Dharma). It can be inspired in part by the charisma of the Buddha himself. Buddhists claim that it is certainly not "blind faith" in just anyone and anything.

In the Kalama Sutta the Buddha himself argues against "blind faith" based simply on authority, tradition or specious reasoning; but Gautama, the Buddha himself, and his Buddhism are exempted by Buddhists from this prohibition: for even though one's own experience is emphasized in accepting Buddha and Buddhism, the counsel of the wise (implicitly meaning a Buddha, ultimately Gautama himself, or a Buddhist master well versed in Dharma) should always be depended upon -- whence there remains a requirement for a degree of trusting confidence in Buddhism, essentially in the authority of Gautama as the ultimate Buddha, based on his spiritual attainment and salvational knowledge.

Saddha, na Wikipedia (com negritos meus).