Are you saying that GEOGRAPHERS don't consider Europe and Asia separate continents? There are still officially 7 aren't there?
Actually, it depends on the book you read. Several textbooks for kids are listing them as N. America, S. America, Eurasia, Africa, Australia, Antarctica.
But you can still choose to define europe as distinct from asia, though the previous designation was geopolitical rather than purely geographical.
Related: shame that Pangaea has been disproved, sure does look like Africa snugs up between N. & S. America.