The razor is used to break ties, the equivalent of a coin-toss. For the religious the tie has been broken, otherwise that individual would be agnostic(which also means the tie is broken for the atheist). There is no logical imperative in its use. The admonition in today's terms is KISS.
Yes, that's possible; but in most cases the hypotheses which are tossed out by Occham's Razor are not on an equal footing. They are tossed out because there is no need for them when a simpler hypothesis is providing an explanation.