'Allah' is the word for 'God' in Arabic and I assume Arabic-speaking Christians use the word, but the idea of non-Arabic speaking believers in the Triune God using the word seems foolish, as imprudent as supposedly Lutheran pastors participating in the Yankee Stadium affair. The 'allah' of Islam is not the one true God.
Once again, Roman Catholicism seems to join C.S. Lewis is suggesting that Tash is Aslan and Aslan is Tash.
Ministers of the Gospel, please remember what a wiser Roman Catholic, G.K. Chesteron, once told wrote: "Tolerance is the virtue of the man with no convictions!"