UAE → ~25.3% of the population
Singapore → ~24.4%
U.S. → ~15%
Turkey → ~14%
Canada → ~13%
All bitcoins are crypto but not all crypto are bitcoins that means out of the percentages of crypto these countries hold respectively some could be altcoins. As you know, altcoins still have alot of cockroaches in their cupboard, so it is better to narrow down to bitcoin only.
When you look at it this way, it’s not about which country has the biggest market in raw numbers, but which one has the highest adoption relative to their population.
Raw numbers do count, remember majority always carries the vote. It will be better if populated countries like US, China, India and Russia fully adopt bitcoin as this will make global adoption even faster compared to if lesser populated countries adopt it first.
We can't neglect countries adoption of bitcoin by population but I think it will be more pronounced if it is coming from densely populated countries.