It helped with <span>financial and industrial imperatives.
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If the citizens were not required, no one may want to. On jury, you may have a case that may take a long time and you may end up sentencing someone to death. It is likely if citizens were not required that no one would want to volunteer.
They all believe in one God, their holy book derives from the Torah somewhat, they generally have the same ethics (don’t kill, don’t steal etc.)
However, Jews are still waiting for a messiah, Christians are waiting for the Messiah Jesus to come again, and Muslims are a bit of a mix, Messianism is alien to Sunni Islam but it is a central belief in Shia Islam.