Dogmatically no, there areis no a holy language in global-christianity to do services or to speak in.
There was a heresy called Three-Language heresy, according to which it was said that the Christian church has only three languages to use in church: Hebrew (not Aramaic), Greek, and Latin. This "dogma" was based on the bible words [Luk[Luke 23:38 kjv]:
38 And a superscription also was written over him in letters of Greek, and Latin, and Hebrew, THIS IS THE KING OF THE JEWS.
and [John 19:20 kjv]:
20 This title then read many of the Jews: for the place where Jesus was crucified was nigh to the city: and it was written in Hebrew, and Greek, and Latin.
So some people are havinghave said that since in the bible is referred to the only three languages, so the church can use the only those,those; even when it sendsends a mission to other non-christianChristian people, the first task is to learnteach the people to one of the languages, and then preach the gospel.
During the times of enlightment of slavsSlavs the pope condamnedcondemned the doctrine as a heresy, and recognized the slavic alphabethSlavic alphabet as a holy language, however exactly this heresy has been persistently preached by German missionaries, and after a series of discussions sparked condemnation by the Slavic teachers.
However, we need to say that in arguments of the heresy advocates were non-empty. The point is that a human is a complex being, and he understands the meanings of words, of speachspeech, inof which he useduses not the only one level to communicationcommunicate. So there areis a high style, a low or "trade" style of speachspeech, and of course a holy level. And this level of course may be used by a human to thefor prayer, and if human don't use the style, all his life is undergoingsubject to desacralizations. It is just one ofthe rules for ascetics rule. For example, the Solun brother had known this rule, and created the church-slavonicSlavonic language as an artificial one based on the Macedonian dialect of old-slavicSlavic language of that time.
In the present time we see the variousevarious languages which isare used as a sacral languagelanguages of a variuosvarious churches even non-Orthodox, or Catholic.