The scene is absolute nonsense; for as far as I know, Egyptian mummies were never revered in this way. When mummified, the animals were either buried or simply gifts to whatever god they belonged to: they did not function as "gods" themselves in this way - let alone so openly, above ground, as if a divine statue (statues that were, by the way, inaccessible to people other than high-ranking priests). Perhaps, if any example would exist of an animal mummy being worshiped this way, one should look into the crocodile cults of, for example, the Faiyum. But with cats, this was never the case.
I won't even comment on the hieroglyphs, the clothing, further details.. it's all bogus.
Wonderful painting though - and an excellent example of 19th century Orientalism.