In many ways a society is already a civilisation, as long as they have a culture that is recognised and a self supporting independent system.
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1.They must have a surplus of food.
2.They must have a division of labor.
3.They must have built cities.
They traded .
If a roman-Greco empire would invade another civilization the defeated civilization's people would become slaves. Usuall women and children
Hinduism and Jainism were the religions of Indus valley civilization.
because they kept saying they were and enventually the generation change over meant people no longer remembered that they weren't.
They are not followed; or the interpretation of them are unclear and they become "lost".