The Invictus Mod expands the Baltic culture into a Balto-Slavic group that includes three tribes mentioned by Herodotus: the Melanchlaeni (Bryansk, Russia), Neuri (south Belarus), and Budini (Kharkiv area). The ancient Slavs were pagan, but as their descendants migrated south, they came into more contact with Christian Byzantium and Christianized from the 6th to 10th centuries AD. Bulgaria, Serbia, and the Czechs Christianized in the 9th century AD. From the Christian point of view, paganism worshiped false gods and idols, and Christianity was the continuation, fulfillment, and successor to OT Judaism. The OT tends to treat religious groups in broad collective terms, as generally either being either pagan Polytheists worshiping false gods, or following Torah and worshiping the one true God. However, historically some pre-Christian pagans like some Greek philosophers believed in Monotheism.
Imperator Rome's game mechanics regarding pagan kingdoms' relations with Judaism are rather basic: Either your kingdom is pagan and over the game's length, the Jewish population in pagan lands may convert to paganism, or you convert your kingdom to Judaism and your Jewish residents stay Jewish in religion.
In my playthrough as the Slavic Melanchlaeni, I conquered the Baltics, most of Ukraine, and Poland, and the Mod lets me make a decision to "Form Slavia." At 220 BC, I've conquered Crimea and Maeotia (Krasnodar region in modern geography). These areas have had a small Jewish population since the start of the game.
I can spend 340 Influence Points and convert my kingdom to Judaism (called the "Israelite religion" in the Mod).
The 340 Influence Point requirement comes from the 140 Influence Points that it takes to move my capitol to a small, Jewish dominated settlement, plus the 200 Points that the Conversion decision directly requires. Currently I have 128 points, make about 1.84 points per month, and will reach 340 points in about 10 years. So converting to Judaism is doable, but a little slow and expensive. Another little downside is that you would lose some of the Slavic cultural feel by abandoning Slavic paganism for Judaism. Plus, joining into Moses' Torah is probably not really necessary for gentiles from a Jewish religious POV anyway; Judaism would categorize them as Noahides and be more concerned that they follow Jehovah and abandon false gods than that you join the particular Covenant that Jehovah made with Israel in Sinai.
The other option is to keep following Slavic paganism.
I guess you could theoretically justify it as "Inclusive Monotheism", whereby all the gods are just emanations of the one true God. But the practical downside is that keeping paganism as your state religion may eventually pressure your whole tiny Jewish population into accepting paganism.
Imperator Rome's game mechanics regarding pagan kingdoms' relations with Judaism are rather basic: Either your kingdom is pagan and over the game's length, the Jewish population in pagan lands may convert to paganism, or you convert your kingdom to Judaism and your Jewish residents stay Jewish in religion.
In my playthrough as the Slavic Melanchlaeni, I conquered the Baltics, most of Ukraine, and Poland, and the Mod lets me make a decision to "Form Slavia." At 220 BC, I've conquered Crimea and Maeotia (Krasnodar region in modern geography). These areas have had a small Jewish population since the start of the game.
I can spend 340 Influence Points and convert my kingdom to Judaism (called the "Israelite religion" in the Mod).

The other option is to keep following Slavic paganism.

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