Excited by the prospect of a prayer actually being answered, the Christadelphian is now attempting to move a nearby mountain to yonder place. However, early reports suggest that he does not in fact possess faith the size of a mustard seed.
Some have asked whether the mustard seed is even a valid unit of measurement for faith, which is inherently intangible. Another interpretation suggests that mustard seeds themselves have faith of a sufficient quantity to move mountains, if only they could talk.
Meanwhile, the ex-Christadelphian has just eaten a salad sandwich with mustard on it, and is feeling a little better. Coincidence? Probably.