Just a general lore question:
You said non human races are neglected.
Does it mean that all the usual gods are considered human gods?
I thought that anyone can worship any god. Its just that some gods are more popular among some races.
In Kingmaker (not DnD, I know) Ekun (human ranger) is a follower of Torag (dwarf god).
When writing this I found another question:
"god" is not a race and god cannot be members of a race. So saying "Sylvanus is an elf." makes no sense. Gods are just gods. Is that correct?
Anyone can worship any god. Some gods may only respond to worshippers of certain races.
The usual gods are all gods of human cultures. Other races can still worship them but most races also have their own gods or pantheons. The "usual" gods are called the Faerunian pantheon -- humans from other continents also have their own pantheons. It may be more correct to say that the usual gods are the gods of the continent rather than of humans as a race.
Gods are not some kind of abstract concept in FR and can definitely be or have been of a race. It's true that deities can appear as pretty much any shape they want, but they all also have favoured appearances. It's very unlikely that any of the many racial deities would appear as anything but a member of "their" race.