Usually, they would kill the male adult converts, imprison the female adult converts and kill or use the children. The Taliban strictly practices Sharia which means they will most likely kill all of them, men, women, and children.
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The Christians that want to leave Afghanistan during this takeover are in grave jeopardy of being tortured and or killed. In order for them to get to the airport which is the only hope for leaving, they must get through the Taliban check points in Kabul and getting through thousands of other Afghans trying to leave. It is said that many will probably be left behind.