The majority of those are 'official pantheons' of the game, esp the monster ones (all of which exist on Oerth, their original home of mention). I was just mentioning some of those that were on Earth. I did miss the Inca/Aztec, but the others are just renamings of Earth Pantheons. Also note that the Loregiver Pantheon is basically the standard FR deities with new skins on them, with a couple new additions. It's not Arabia. Mulhorandi and Unther are Egypt and Babylonian, respectively. Celestial Beauacracy = Chinese and/or Japanese.
I've been with FR since the first boxed set. There aren't more then I think.
Mask is technically apart of the Mulhorandi Pantheon as part of a kind of exchange program where the Faerunian Pantheon got Sharess Bast as a "dual" citizens of a sort.
And yes they are are Egyptian (or more acuurately Grecoegyptian as they use mostly Greek names for these Gods, not the Egyptian ones, as well as Greek linked traits, including less animalistic in forms, amd weirdly with Hindu over tones), and other RL Pantheons of Gods, but even the main FR Pantheon has RL Gods in it, like Silivanus (Roman), Lovitar (Finnish), and others.
And either way still Gods competing for Worshippers and multiple Pantheons RL origins or not.
BTW I think FR is the only other Setting besides Planescape and to a lesser extent Spelljammer that uses RL Gods, I don't think Greyhawk does.
Still serves a function, reinforcing the immigration themes of the Forgotten Realms, where even most of the Gods are immigrants to Toril (with some exceptions, like Selune, Mystra and Shar).
And the Al Qadim Pantheon is not reskinned Faerunian Gods, that is just fan speculation and there is evidence in setting materials that they aren't (for one thing Al Qadim Gods don't have alignments but Faerun Gods do, and other things). This misconception was sparked by the similarities between the name Selune and the spelling of the Al Qadim Moon Goddess.
And Mazatica's Pantheon is inspired by Mesoamerican Mythology, but it's not the same Gods, there is no nation in the Actual World that has ever worshipped the Mazatican Gods.
And the Celestial Buracracy is also inspired by Chinese religion, but with different Gods except for the Celestial Emperor and Yama, which is also a Hindu God.
Interesting to note that woman who added the Hindu Pantheon to FR may have mistaken Indra for his wife who sometimes goes by the name Indrani, and who also rides and Elephant as her vechile, but who is said to have been born of a Demon, but was made Immortal when Indra married her, and as well becoming the Queen of the Gods.
The Immigrant Gods makes FR religion very different from other material plane settings in D&D religiously.