|Read Your Bible - Pray Every Day|
Reading your Bible is something between you and God and my prayers would not be effective.
Actually God has done all he can do to provide salvation, we cannot force someone to receive Jesus. They have a free will and are responsible for their own salvation.
We need to approach praying for others with a fresh awareness that we don't have the answers for them but that we know the One who does.
At times we pray for someone to be healed, and the sad fact is that they have damaged their body with obesity, smoking, drinking and even prescription drugs (or the other kind of drugs.)
Perhaps there is unconfessed sin that is blocking their communication with God. “Is your all on the alter of sacrifice laid?” is a good question.