It's not about converting to a religion, it's about becoming part of a people/nation and then serving G-d the way he asks them to.
Ruth 1:16-17
“…For where you go I will go, and where you lodge I will lodge. Your people shall be my people, and your God my God. Where you die I will die, and there will I be buried…”
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https://www.youtube.com/watch?v=hoNZgjqiKQ4