But they are false gods, liars, and murderers. They even admitted to killing Nerevar to use the Heart of Lorkhan. Besides that, they are no longer gods and the Tribunal temple has turned back to the original method of worshipping their ancestors.
I don't mean to burst your bubble, but... Just sayin'.
No, they are real gods, just with stolen godhood. And they changed time so they were always gods and mortals both at once. Vivec admitted that HE killed Nerevar, but at the same time he didn't, and murder is part of Vivec's persona, so it works. And the Daedra are also liars and murderers, and I can make an arguement that the Divines are also "False Gods" and murderers. And their accomplishments are still great. Vivec achieved CHIM and told his people how to follow in his footsteps, Sotha Sil created the most advanced technology in the Mundus, even making the Dwemer look primative and made the pact with the Daedra, and Almalexia defeated Mehrunes Dagon. Don't be fooled by Azura's (who is not a very nice godess at all) propaganda.
We don't know what happening in Morrowind in terms of religion. Vivec certainly wanted to revert to ancestor worship, but he never seems to have achieved that.