Firstly, they don't 'teach' anything in church, they simply indoctrinate into their dogmatic belief system. You don't need to be told that god disapproves of you molesting your infant sisters to know that you have no right to do such a thing to them.
This is reasonably true in almost every case. Most people have the law naturally built into them.
The thing that nobody would know about is the forgiveness offered by Jesus sacrifice on the cross, His death, and His resurrection from the dead.
John 3:16... words of Jesus:
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For God so loved the world that he gave his one and only Son, that whoever believes in him shall not perish but have eternal life.
Salvation is the most important teaching. They would not know it if the church didn't teach it. And if some people happen to become indoctrinated rather than simply taught, all the better. Eternal life is something that they will receive. This is of paramount importance. Eternal death is no fun.
