So assuming that the name Tosh Raka is intentional, and the Ka Po Tun basically revere Akatosh, where would that leave Lorkhan in their religion? After all, if Lorkhan and Akatosh were basically enemies (what with the tearing out of the Heart and all) does that mean that Lorkhan would be like their devil? In which case, it would make sense that the Po Tun dislike Humans, because I think I've read that Lorkhan is revered as a hero of early Humanity...or some crap.
Still, though, do the Ka Po Tun just ignore Akatosh's relation with Tamriel? After all, Martin turned into an avatar of him.
The Tsaesci, being described as Mannish in some creation myths and being the metaphysical men in the echoed Akavir conflict, most likely revere Shezarr in some way. They might call him something different, but still might revere him. However, with the potability looming that they had a hand in the Redguard's anti-Shezarr creation myth (it was either them or the left-handed elves that caused this) then it might not be true. It is also possible they worship Azura to some degree (due to Dawn/Duskfang).
The Ka Po Tun are most likely very focused on Tamriel. After all, that's where Tosh Raka became a Dragon and where their epic battle took place. Well, that was another (much larger) Tamriel, but the modern day version is still the center of it all. Why do you think the Akaviri keep invading? Why do yout hink the Redguards left Yokuda, the Elves Aldmeris and the Nords Atmora?