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, KJV). 


Romans 14:5 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).


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?
This is one of my favorite scriptures to turn to with questions like this.


  James 1:5 if any of you lack wisdom, let him ask of God, that giveth to all men liberally, and upbraideth not; and it shall be given him. 6) But let him ask in faith, nothing wavering. For he that wavereth is like a wave of the sea driven with the wind and tossed.


So James tells us that we should ask God for any knowledge that we don't know. But with a condition attached. You need to ask in faith that God will answer your question. If you do so its promised that the Lord will give to you freely. And He always keeps His promises. I would add that @San Jacinto was right on in that you need to be humble in asking as well.