America was not named after the person who discovered it, for it would have then been known as Columbia, but after the person who realized it was a different continent all together, Amerigo Vespucci.
As for Islam being weak, I agree that the lack of an Ottoman superpower would ease the pressure on the European Christian states. Vienna would be quite safe in this timeline, even though it might not develop beyond the size of a village. However, the inverse effect exercised by the resurgent Roman Empire on the muslim world might have accelerated the emigration and subsequent conversion of the peoples lying beyond the edge of the map. I wouldn't be surprised to see that the whole of subequatorial Africa practices a form of Islam, as does India, Indochina and Indonesia, while muslim explorers, traders and colonists might have established 13 colonies on the coast of Australia, colonies now enjoying a long period of "salutary neglect."
As for Islam being weak, I agree that the lack of an Ottoman superpower would ease the pressure on the European Christian states. Vienna would be quite safe in this timeline, even though it might not develop beyond the size of a village. However, the inverse effect exercised by the resurgent Roman Empire on the muslim world might have accelerated the emigration and subsequent conversion of the peoples lying beyond the edge of the map. I wouldn't be surprised to see that the whole of subequatorial Africa practices a form of Islam, as does India, Indochina and Indonesia, while muslim explorers, traders and colonists might have established 13 colonies on the coast of Australia, colonies now enjoying a long period of "salutary neglect."