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Lit., "has been bestowing". Since the form nazzala implies gradualness and continuity in the process of revelation, it can best be rendered by the use of the present tense.
Lit., "who hold discordant views about the divine writ" - i.e., either suppressing or rejecting parts of it, or denying its divine origin altogether (Razi).
From the mere physical regulation we are at once lifted up into the sphere of morals and faith. For the one acts and reacts on the other. If we are constantly carping at wholesome regulations, we shall do nothing but cause division and schisms among the people, and ordered society would tend to break up.