What have you read so far? I'd recommend Feser's "Five Proofs of the Existence of God" and then move on to arguments specifically for the resurrection (NT Wright for example). I'm all curious which doubts in particular you are having, feel free to list a few. As far as wishful thinking goes, it's worth mentioning that atheists too engage in wishful thinking. Thomas Nagel
http://admits https://www.goodreads.com/quotes/325845-in-speaking-of-the-fear-of-religion-i-don-t-meanthat he doesn't want God to exist and that the thought makes him uneasy. So people on all sides do this.
My view is that there must be some purely actually entity that exists (stage 1), this entity would have to have properties we commonly ascribe to God such as power, simplicity, and goodness (stage 2), monotheistic religions best fit this description (stage 3), the Catholic-Christian worldview is a better fit than other religions, since it A. best deals with the problem of suffering in that all humans can be brought into joyous relation with God and B. is based on the life, death, and resurrection of Jesus Christ, which can be established (or at least rendered very plausible) by historians (stage 4), and finally that living out a Christian life fills me with great joy and just feels right (stage 5).
Most Christians who don't study philosophy just jump right to stage 5--they know it in their heart to be true and that's that. But for a lot of us on these boards, we thirst for a greater defense than that and hence dive into the first four stages. Also, I should have mentioned that preceding all this (call it stage 0) is a defense of scholastic metaphysics, which is presupposed by arguments for God in stage 1.