Have you introduced someone you did not know? Typically, we fumble across the details of their lives and end with a sheepish grin (we are programmed to save face). We can only introduce who we know and what we know about them.
I chuckle at myself when I remember my early views of sharing the gospel. At a young age, I knew I needed to share Jesus with my peers. My methodology was misguided. Instead of asking my friends if they wanted to hear about Jesus, I held them hostage.