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How to help new christians
Pray together.
Leading in a prayer is a great place to start because it's easy, requires no materials and can be done anytime, anywhere for any reason. Address in prayer any problems that either of you are going through.
Ask for his guidance as the new believer begins the journey, and encourage your friend to add something to the prayer, if desired. As far as the conception that prayer isn't allowed in public school, that's nonsense.