In this study, we evaIuated belief, faith and doubt according to the psychology of religion. Firstly, we explained the differences between belief and faith. Because, belief is a more static term, on the other hand faith is a much more dynanıic term. Secondly, we studied "how does belief become faith?" and saw that some influences are stimulating the growth of belief into faith. Finally, we discussed the relationship of belief and faith with doubt. To sum up, we understood that belief is different from faith and that belief and faith have a relation with doubt