While the Church is shrinking in the 'West' - much because of the spread of secular humanism and materialism, the Church in many poor areas of the world, such as Africa, is spreading and growing at a incredible rate. This is the history of the Church. In some centuries the Church flourishes in certain areas of the world. Then it may diminish there, but flourish in other areas that had been previously evangelized. The Church overall is still thriving.
Even in terms of what the ROMAN CATHOLIC CHURCH accomplishes each year, it is thriving.
There is no other organization in the world, including all governmental and UN organizations, which even comes close to the charitable help given to the poor, destitute and needy all around the globe, than thru all  the Catholic organizations, not the least of which is Catholic Relief Services.