As we all know, when the atmorans arrived in mereth they brought with them their own animal gods and beliefs, dragons being chief among them. However this doesn't make sense because dragons had a heavy presence in akavir at the time of ysgramor, once the atmorans settled in mereth which they named Skyrim, dragons came to tamriel because they were getting their asses handed to them in Akavir.
Now how does this fit in? The atmorans when they lived in atmora had a pantheon with dragon being chief, there were no dragons in atmora. please explain