No, it is not a Muslim majority country. Greece is over 98% Greek Orthodox, having expelled its minority Muslim population in 1923 in population swaps with the Republic of Turkey.

islamia college mba have in muslim minority list

Gambia is predominantly Muslim but they also have a minority of Christians

There is more racisim in a place with minority

The majority of the population in Greece is ethnically Greek, making up around 98% of the population. There are also small minority groups such as Albanians, Turks, and Romani people.