It's an effortless oneness or equality with everything. There's not necessarily an object to one's faith, such as faith in God or in some other entity. One simply has faith. While faith can't be adequately explained in words, it implies an understanding of the true nature of reality. Most Nichiren Buddhists go so far as to say that faith itself is enlightenment.
Some religions emphasize fear and superstition, which are, in a way, the opposite of faith.
Some people tend to cling to this kind of orthodoxy or chauvinism out of fear rather than faith. When one has faith based on the Gohonzon it does not mean that other sutras, teachers and teachings should be erased or ignored. Rather, our mind of faith illuminates all teachings, revealing their wisdom, value and vision. Growing in faith begins with our willingness to release ourselves from chauvinism and to open our eyes and ears to a multiplicity of views. After all, the purpose of Buddhism is for us to become Buddhas, not necessarily Buddhists.