Others have had doubt at times (Luke 24, etc.). Doubt can be a powerful enemy, however it can also be a close friend. Because you "doubt" (and this may take on several forms) it is drawing "you" to study, pray, examine yourself, your beliefs, etc. Presently, this appears to be causing you to mature in the LORD. When doubt causes you to desert the faith and/or be on a collision course with continuous sin you have something to be concerned about, however when it drives you to be repentant and say; I don't understand this? why this? Why is it said this way? why does this seem so Arminian and not Reformed? (I am sure I will hear about this one) and then you study it out and see the truth, it is something you may actually rejoice about. I believe the later is here evidenced by your humility to share your heart in this area. When you stop asking questions and quit searching for answers, then examine yourself, whether ye be in the faith (2 Cor 13:5). Ask yourself is your doubt driving you toward Emmaus or Jerusalem (Luke 24)?

Just to state emphatically, "It is ALL true" and "Christ really is who He says He is," however He desires us to know this (Him) in a deeper and ever widening way and thus sometimes doubts will occur to drive you to yet a deeper more intimate relationship with the LORD.

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2 Corinthians 3:18 But we all, with open face beholding as in a glass the glory of the Lord, are changed into the same image from glory to glory, even as by the Spirit of the Lord.
All this said, I think what you are "doubting" the most is: (1) whether you understand enough to be an able minister, and (2) if you will be able to answer every question that is ever posed to you by others. As to (1) As far as being a perfect minister, none are--thats what grace is about. A true congregation desires a pastor who is continuing to mature in the faith once delivered. As to (2) The BAD News is you won't be able to answer ALL the questions and the GOOD News is "God doesn't expect you to" (thats His job). However God will enable you to keep the main thing (the revelation He has given) the main thing.

Do NOT count on seminary (if this is a goal) to answer ALL your questions. Indeed, if it is a true seminary (i.e. if you really learn anything) you will have more questions when you leave then when you arrived. However, a good seminary will also teach you how to deal both rationally and emotionally with those things that are just <img src="/forum/images/graemlins/Banghead.gif" alt="" /> (true faith continues on in spite of these things, because true faith is not only knowledge). You remain in our prayers.