This definition does not prevent a non believer having respect for others beliefs. Only if you have "faith" can you truly understand it, if you do not, then one does not.
I do not have any strong "Faith" but I have total respect, for those that have, in fact I wish I could have such a strong faith.
Religions are so diverse, that each, if they totally believe in their own, must consider the others as incredulous.
EG. surely a devoted Christian cannot consider Buddhism to be credulous. But they can respect a Buddhist for his beliefs.
I agree, "all we need to do is be nice" that is what most religions teach, including humanist.
Vive la difference