China
By 2018, official Chinese government statistics said there were 39 million Protestants in China. Scholars estimate that including house church worshipers pushes the real number to at least 80 million — almost 6% of China’s population, on par with Communist Party membership.
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North Korea 'church' doesn't look like any other but it exists: watchdog
Being a Christian in North Korea means using secretive, spylike tactics to read the Bible, facing threats of the death penalty, and circumventing propaganda with tales of believers harvesting organs, according to persecution watchdog groups.2020-05-14
Kim Jong Un, the leader of North Korea, has tried to stamp out any religion in the Hermit Kingdom but that hasn't stopped outside missionary groups from sending Bibles and other messages of hope in. (The Voice of the Martyrs)