One place to start might be the historical witness
First of all I think that the only way to know the Truth is to believe in the Truth.
However, I do not think that the christian faith is a blind belief, but it has solid rational foundations. I can say that my faith is not based on a blind assent to an historical claim.
The fundamental reason why I believe in Jesus Christ, is that I find that the christian concept of God and of divine love is the highest possible concept. I find that the idea itself that God loves us so much that He chose to assume the human nature and accepted to suffer crucifission in order to save us, expresses such a high concept of God and of divine love that it can comes only from God and it is certainly a truth. This concept is fully convincing for me, it proves itself by itself and makes superfluous any other arguments . I believe that Chirst suffered His Passion to help us to have faith in Him and trust Him, to make us understand that God loves us infinitely, that God is good and mercifull and that God is near to us so that we may totally trust Him and open our heart to Him, be in communion with Him and be saved.
There are other religions teaching that God is love, but the problem is to define what the word “love” means, because by itself it could be only a vague and generic concept.
The christian faith is unique because it gives a very concrete and unique meaning to the concept of divine love: in fact God’s love actualizes in the acceptance of a terrible physical suffering; the God of the christian faith loves us so much that He is willing to suffer a painful death in order to save us. In the christian faith, love is not only a theoretical and vague concept; Christ’s Passion is a clear and concrete realization of the concept of divine love which teaches us what is the true meaning of love.