Does yearning to know more about God for a stronger relationship leave us hanging in confusion?

Many times we try to ask questions not to challenge the Christian faith but rather to know more and perhaps draw closer to God. How can one get the confidence in trying to explain to and convert a learned and highly educated unbeliever who always has strong reasons from philosophy, logic, psychology etc to support his rigid stand? The bible actually seem to halt us in seeking to know more from God. > who art thou that repliest against God? Shall the thing formed say to him that formed it, Why hast thou made me thus? ([Romans 9:20](https://www.biblegateway.com/passage/?search=Romans+9:20&version=KJV) , KJV). [Romans 14:5](https://www.biblegateway.com/passage/?search=Romans+14:5&version=KJV) also says: > Let every man be fully persuaded in his own mind. And then we have this: > For my thoughts are not your thoughts, neither are your ways my ways, saith the LORD. [...] so are my ways higher than your ways, and my thoughts than your thoughts. ([Isaiah 55:8–9](https://www.biblegateway.com/passage/?search=Isaiah+55:8-9&version=KJV)) . These and many more make me feel incapable of winning souls for Christ and often leaves me hanging and tongue-tied myself. How do we manage this as Christians?