With all that's been said here, we have this, we do not know what the originals were written in, we have none of them. Those originals were copied over and over and probably in many language of the first century. They would have been copied into a language for the intended audience. There were churches established in Jewish communities and Greek communities more than any other, we are told of Ethiopians receiving the message. Aractus has noted that the NT is seen in many older languages. Like he said Greek was the most common language and those who could write would do so in Greek, Greek was the language that was in the educational system of the time. None the less originals could have been and probably were written in Greek and Hebrew for the peoples they were intended for. Nevertheless what does it matter what language they were originally written in we do not have them. Also, Paul being a Roman citizen would be able to speak and write in Greek and, being educated in the Jewish community and probably by priest could speak and write in Hebrew and Aramaic.
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God loves those who believe and those who do not and the same goes for me, you have no choice in this matter. That puts the matter of total free will to rest.