First, you don't need to have 'faith' that your friend exists. Ordinary experience shows that.
Second, if you don't know whether or not your friend is where you are going, that faith can be badly misplaced.
Third, unless you have verified that the friend intends to be there when you are, the faith can be misplaced.
Fourth, if you had no evidence your friend exists, have not communicated with the friend, and have no reason to think the friend will be there, then you *would* be gullible to believe the friend would be there.
In the case of religious 'faith', there is no evidence supporting the existence of the deity you have 'faith' in, there is no way to reliably communicate with that entity, there is no reason to think the texts you have chosen are actually representative of that deity, and you have no reason to think that the deity is anything but a collective delusion.
So, yes, as I see it, that belief is a form of gullibility.