We can interest others in the gospel of Jesus Christ. How? It is by making it attractive to them. We will be showing to them the difference it has made in our own lives.
That is the best done by following the words of Paul in Colossians 4:5. "Be wise", he said, "in the way you act toward outsiders. Make the most of every opportunity". If we show kindness, love, and compassion to others, those who observe us will wonder why, and that may give us an opening to tell them about the beauty of God's love for them.
The beauty of a changed life can attract others to the One who makes us beautiful. Your walk with the Lord is the lesson you teach to the one you're sharing to. Be a role model. Also, be true to your words. Let them show in your actions too, not just by words.