If someone isn’t a Christian and they go from poverty to becoming super rich overnight, the odds are they will never convert. They’ll begin to trust in their riches, so it isn’t likely they’ll ever turn to Christ. That’s not to say they can’t get saved, but the money becomes a barrier.

“Then Jesus said to his disciples, ‘Truly I tell you, it is hard for someone who is rich to enter the kingdom of heaven. Again I tell you, it is easier for a camel to go through the eye of a needle than for someone who is rich to enter the kingdom of God.’Matthew 19:23–24