Would you say Europe and Asia are the same continent?

Yes, Geographically (Geophysical) speaking; till the humans made Europe a separate continent. No other pair of continents have the kind of border that Europe & Asia share between them - totally artificial.

The division is more political than anything else. Like Berlin, where for decades we had a West Berlin and an East Berlin, solely due to political issues.

Geologically Europe and Asia are a single continent: Eurasia. However, for cultural, historical and political purposes they are treated as two separate ones.

Indeed a tricky concept.

In Russia the division is fairly obvious - the Ural Mountains, which conveniently run north to south across much of that country, dividing it into the western part, with three-quarters of the population, and the eastern part with three-quarters of the land area.

Simply culturally "Europe" has seemed an entity and "Asia" to Europeans has seemed "the other place". And for a lot of history as seen by Europeans that has been the case, even in Roman times when there was much trade between China and Europe and North Africa etc.

You could even argue for a continuity with Africa, since Asia (the Middle East part) s actually not separated from Africa except by the artificial waterway called the Suez Canal.

There is one city which is in Asia and in Europe, and that is Istanbul - the two parts separated by the narrow Bosporus (a seaway, though narrow), with a recent (1970s) bridge and many ferries linking the two parts.

Europe and Asia are on the Same Land mass, However someone decided to make it two continents.

Geographically, the world's largest landmass is Afro-Eurasia. Prior to the construction of the Suez Canal, there was no divide between the landmass we refer to as "Africa" and the one that we refer to as "Asia." Europe has been considered a separate region for centuries, but that's mainly due to the fact that the culture is quite different from many parts of Asia, though why that ought to be enough to merit Europe being considered its own continent is unclear as Asia is a vast territory populated by many different kinds of peoples who are all strikingly different and distinct from one another.

Geo-politically, Europe, Africa and Asia are considered separate entities, even if they might not have been divided geographically. So, when asked if I would consider them to be separate continents, the answer would be: "Technically no, but semantically yes."

Asia is a sub-continent.

No

Long-standing convention defined Europe and Asia as separate continents, even though the boundary (the Ural Mountains) was not a water boundary. In a physical sense, it would make more sense to define India as a continent separate from the rest of Asia, as India sits on a tectonic plate that is moving relative to the rest of Asia. It is "colliding" with the Himalayas. In plate tectonic terminology, the Eurasian Plate is indeed considered all one continuous thing. (Though Eastern Siberia lies on the North American Plate!)

True, but the continent is separated by people with different roots, although Russians seem European. Europe represents the former Roman Empire.