The UAE is the main home of the Maliki Branch of Islam, one of those few off-shots which is genuinely tolerant.
Yes, they do decorate for Christmas including the airport. It is “secular” in that there is no nativity scenes. The music does sometimes get through as I’ve heard “O Holy Night” in the mall” :) St Joseph’s parish has around 20 masses for Xmas. 10 are outside due to the number of people, around 3,000. I’ve attended and it is a wonderful experience.