It is important to understand world religions, such as Islam, Buddhism, Hinduism, the New Age movement, and to understand one of the key passages to use when sharing your faith with someone from one of these religions or religious background, Ephesians 2:8-9, which says, “ For it is by grace you have been saved, through faith—and this is not from yourselves, it is the gift of God— not by works, so that no one can boast.”
What I think is so striking is that we have two different categories of religions. Most of the religions of the world are based on the idea that you have to work your way to salvation (Islam, Buddhism, Hinduism, among other major religions fit into this category), then you have Christianity which says that there is nothing you can do to merit the favor of a holy and righteous God. There is no way you can pile up enough good works that would make God grade on a curve and let you in to heaven. You cannot work your way into heaven. It is not works that save you, but it is God’s grace and faith in that grace that saves you. And recognizing this grace must come by recognizing Jesus Christ, who came and died for our sins and paid the penalty that we should have paid so that we might have everlasting life.
So Ephesians 2:8-9 is such a key passage when dealing with people of other religions or other faiths because we need to help them understand this. We need to help them understand that there is nothing they can do through good works to achieve the holiness that God demands. But the good news is that we can take on the holiness of Christ as we accept him as our Savior and Lord.