An app called Bless Every Home, which has been backed by some of the biggest names in evangelical circles, is mapping the names and addresses of immigrants and non-Christians.
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How Evangelicals Use Digital Surveillance to Target the Unconverted
https://newrepublic.com/article/179397/evangelical-app-targeting-immigrants-surveillance
The hot new thing in proselytizing is an app that allows Christian conservatives to collect data on whole neighborhoods of potential converts.