Oh yes you do! If you cannot answer ONE question atheist will just walk away laughing, saying "this Christian does not have an answer but I do!"
You just re-enforced atheist's belief.
[EndSeeker] I don't know everything but... now i feel Gods presence everday...
[Me] ... absolutely interested in that .... what does it feel like
[Me] I have lots of knowledge ... but I would trade it for God presence any day .... well actually I would like both .... I get God presence about once every 5 years ... hungry for more
When I was a young christian I was visited by Jehovahs Witnesses my pastor told me to not get involved with them, fearing I did not have the knowledge. Rather I was hungry to know the truth, I searched the bible, I searched book, after book after book, I studied the greek. Now I know how to beat a Jehovahs Witness. God is bigger than the lie. There were arguments that stumpped me, I could not find the answer, but I prayed, now I have the answer. The same is true for any form of witnessing, you will start out stumbling, falling and mumbling, and end up a conquerer.