This is a true story told by one of the first missionaries to enter Russia:
In Russia before the Berlin Wall came down and freedom to worship freely
was against the law, many Christians were forced
to get together in secret to worship the Lord. One group of Christians were
gathered together in a simple house studying the
Bible when suddenly the door was thrown open violently and three Russian
soldiers burst in with rifles. One of the soldiers
bellowed out that anyone who wasn't a Christian could leave immediately but
anyone who had come to worship God should
stay.
After a moment of silence many of the people filed out of the house leaving
a few people behind. One of the soldiers closed the
door behind them and locked it, then the soldiers all put down the rifles
and explained to the remaining few that they also were
Christians but they only wanted to worship with true believers. Could you
pass such a test of your faith?