When it comes to the entire region
Christians now make up 5% of the population, down from 20% in the early 20th century
Recent spread of Jihadist and Salafist ideology, foreign to the tolerant values of the local communities in Greater Syria and Egypt has also played a role in unsettling Christians' decades-long peaceful existence.[11] It is estimated that at the present rate, the Middle East's 12 million Christians will likely drop to 6 million by the year 2020
The largest Christian group in the Middle East is the originally Egyptian speaking, but now Arabic-speaking Egyptian ethnoreligious community of Copts, who number 6–11 million people,[2] although Coptic sources claim the figure is closer to 12–16 million.[
When it comes to Syrias Catholic population this is the breakdown. Its from 2010.