Maybe at a later age they'll turn to God.
Most people seem to only turn to God when their lives become very bad. So considering how bad things are now - it'll only get worse, and for larger portions of the population - so there is some hope. We all should try to show God's teachings to others, and never engage in debates. And if you see someone living a sinful life, then leave them a message, but don't respond to any bad things they reply with - let them be alone, and hopefully then, or when they're down, they'll truly read the message.