Arabic should not be seen as an Islamic language, but it should be seen as a language that has a very distinct Christian culture to it, too. I pray that this may continue to expand, that many Arabic-speaking people around the world would come to faith, and that there would be significant modern theological works written in Arabic by Arabic-speakers. Now we just think about the Arab world as being such a dark place spiritually, but certainly the Lord is still working there.
In the 4th century Augustine of Hippo was in a totally Christianized land, in North Africa. Within a few centuries, all of that area would become totally Muslim. Is it impossible to imagine that after 1400 years God would desire to make those areas totally Christianized again? I can see that historically Arabia does have its own Christian culture, and be hopeful that this culture will become even larger and richer in the coming years.