The Faerunian Pantheon has too few gods, who are way too active.
Seriously, the game mechanical purpose of having a god is to have clerics. There's no real problem except that the players and GMs have more choices of types -- unless you have them doing stupid stuff like the Avatar Trilogy, Prince of Lies, Crucible, the Demonweb Pits thing, etc., etc., et-bloody-cetera.
So here's my alternate Realms:
Ao announces, "You know, I thought you idiots would have gotten the message back with the Time of Troubles. Apparently you didn't. Okay, I'm now rendering all of you unable to either leave your home plane or manifest avatars. No imparting Chosen with divine power anymore, either."
"Now, Mystra, I'm taking the power of your Chosen and some more directly from you and making six mortals into demigods of magical schools. Yes, Cyric, this means you lose illusion. Shar, nice try, but you lose the Shadow Weave. My cosmos, my rules. This'll rework how magic operates, but I don't care."
"Now we're going to do some pantheon mergers, first the Mulhorandi. Anhur, Geb, Hathor, Osiris, Thoth, we have no jobs for you. Horus-Re is the new god of the sun. Isis, you're goddess of rivers now. Nephthys, report to Helm or Kelemvor about guarding graveyards and burial goods. Sebek, you get swamps and all kinds of swamp reptiles everywhere, no need to thank me. Set, you're the desert and snakes."
"No, we're not keeping racial pantheons, either; too much duplication. Lolth, spiders and drow. Ghaunadaur, you're fine. Elistraee, you're demigoddess of swordwork and, oh, joy in battle now. Abbathor, we can use a god of greed. Berronar, Clangeddin, Dugmaren, Gorm, Haela, Marthammor, Vergadain, sorry, a bit short on positions. Berronar, we need a goddess of marriage and motherhood, you're it. Psionics need a goddess, Duerra. Dumathoin, you're everybody's god of mining now. Laduguer, patron of the duergar and crafter of magic weapons are open, so you get 'em. Moradin, you get patron of the dwarves and god of stonework. We don't have anybody doing heling and mercy, so you're in, Sharindlar. Thard Harr, you're the new god of jungles, keep up the wild-dwarf-patronage."
"Aerdrie -- avians, avariels. Corellon -- elves, or eladrin, or whatever; if you want a school of magic, sure. Deep Sashelas -- aquatic elves. Erevan, mischief. Fenmarel, scapegoats and isolation. Hanali Celanil, fine art and artistry. Labelas, time and longevity are fine. Rillifane, we've got enough woods gods, thank you. Sehanine, dreams are good, so are moon elves or eladrin or whatever. Solonor, we don't have an specific archery deity, of you want to be the demigod of that, fine."
"Baervan, you're the new god of illusion. Baravar, we have gods of forests and travel up the wazoo. A general god of the Underdark and of svirfneblin is fine, Callarduran; Shar won't like it, but I don't care. Flandal, mind being demigod of physical fitness and atheltics? If you want to stay, we'll cut into Lathander's portfolio a bit. Gnomes and gemcutting, sure, Garl. We have enough of your type already, Segojan. Urdlen, uncontrolled impulses and spriggans, okay. Yondalla, halflings, family, and and children, sure. Male orcs and strength for Gruumsh, servitude and female orcs for Luthic, and the rest of you are duplicates."
"Okay, now, any gods I dismissed? I'm setting up lares, penates, tutelary deities, muses, and other assorted minor quasigods. Want to be god of a specific skill, profession, geographic area, or whatever? Form a line to the right to apply. I'll take anyone who wants one. No constant belief necessary to exist, though number of worshippers still means power. Lots of available slots, I'll start out with a hundred or so."
"Okay, a few-super divine adjustments to to reflect the new divine order, and let's see if it runs any better this time. Otherwise I'm just gonna off all of you gods and let the Zahkaran pantheon take over." Hand of Ao waves . . . .