What would become of people who were brought up in a Bible believing church but were enticed to join a cultist organization who only believe certain parts of the bible and back up their beliefs by brainwashing methods? Can the poor people be blamed for being led wrongly?
If the people were saved while they were in the Bible believing Church, the Lord will go after them and bring them back like a shepherd goes after his lost sheep (Luke 15:3-7). He will do this no matter how or why they wander off because He promised His father He would never lose any of us. Here’s what He said.
All those the Father gives me will come to me, and whoever comes to me I will never drive away. For I have come down from heaven not to do my will but to do the will of him who sent me. And this is the will of him who sent me, that I shall lose none of all those he has given me, but raise them up at the last day. For my Father’s will is that everyone who looks to the Son and believes in him shall have eternal life, and I will raise them up at the last day” (John 6:37-40)
Also, Ephesians 1:13-14 says we were included in Christ the moment we heard the gospel of our salvation and believed it. At that time we were given the seal of the Holy Spirit as a deposit guaranteeing our inheritance. There’s nothing anyone can do to change that.
However, if they left the Bible believing Church without being saved, then they’re not part of the Lord’s flock and are fair game for the cults. This doesn’t mean they’re automatically condemned to hell. They can still receive salvation at any time in their life. All they have to do is admit they’re sinners and believe that Jesus died for their sins and rose again. Once they do they’ll be His forever, just like the rest of us.