Judaism historically has been never a proselytizing religion.
However, it is not forbidden according to many opinions to teach Torah to the Gentiles (although this is a major dispute among the Halachic Authorities, see here for more).
The Netziv (Meshiv Davar, Yoreh Deah 77) says it is a mitzvah to teach the gentiles Torah Shebichtav, the written law. He bases this off the Be'er Hetev, the stones that Hashem commanded Yehoshua to write on them the entire Torah in the 70 languages of the nations. The Netziv says that clearly the implication of such a commandment is that the Nations were meant to read them.
The Netziv uses this to allow the teaching of Torah Shebichsav to gentiles, as the prohibition of teaching Torah to gentiles is only regarding Torah Shebaal Peh, the oral law.
The Rambam writes in a responsum (§149 in the Blau edition), when discussing the prohibition of teaching Gentiles Torah, says it is permitted to teach Christians the written Torah, and may even be more fruitful, as they implicitly accept the veracity of the Torah and text, thus creating a more level plane with Jews, and therefore allowing for discourse to show them their incorrect interpretations.
The Rambam writes:
ומותר ללמד המצות לנוצרים ולמשכם אל דתנו
It is permitted to teach Christians the mitzvos and to draw them to our Religion