Sharing the Gospel within the context of first, showing us our sin and following up with the Savior is how Paul in Romans 7 explains how he understood his need for the savior. 

Here I encourage you to step out of your comfort zone and be willing to preach the Gospel to nonbelievers in day to day basis. That you dont need all the knowledge in the world and that "Christ crucified" is enough. 

Hope this episode is of some encouragement!