Does reviling the religion again with the intention of clarification necessitate renewing the ghusl, according to the Maliki school of thought?

All religions other than Islam are considered disbelief (kufr) by the Malikis and others, by agreement of the jurists. However, the Malikis differed regarding the obligation of ghusl (ritual bath) for an apostate if they revert to Islam. Some of them hold it to be obligatory, while others do not. Your statement to your mother was not an act of apostasy but rather an act of informing, so ghusl is not obligatory upon you. Furthermore, one who relates a statement of disbelief without believing in it does not become a disbeliever, by consensus. As for abandoning prayer until its time expires, this is among the major sins and may amount to disbelief. You must make up the missed prayers and be diligent in observing them in the future.