Christians make up more than 35% of the population of the United Arab Emirates. The resident population, not the citizens, which are almost 100% Muslim. The Christians are part of the floating mass of cheap labour that comes from other Arab countries, Pakistan, India, Bangladesh, the Philippines, and whose presence there is bound by the work contracts that are little more than a form of bonded labour. This is the case also in Saudi Arabia where it is estimated that there are 1 million Catholics.
There's an article about the UAE here.