So you are sharing your faith. Your friends are listening politely, but you just seem to get stuck. They don’t get it, they don’t understand the concept of grace, or of substitution…or one of the other concepts that make up the Gospel.
No fear, God’s creation screams of His presence, and He has provided us with hundreds of analogies that can help to reveal his heart for humanity. Yes it’s true that no analogy is perfect, but there is power in telling an earthly story to communicate a heavenly principle. Jesus himself did that, and we call them his parables. You can learn to do that too!