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Yeah this is always difficult. But at some point of life I think doubts and questioning are a part of faith, otherwise it will always stay just a childish kind of faith.
Maybe you should think about what are the reasons that make you question Christianity. Not feeling good in your church? Having unsureness about some specific parts of the beliefs? Doubts about the historic background of Christianity and whether it is true? And according to what your issue is, look for answers to it. Talk to Christians who are more educated and might know the answers or at least some of them. Or look for literature; according to your topic of interest - about spirituality as well as about the history of Christianity and the bible, how it was written and translated. - For example about this, the book "How we got the bible" by Lightfoot.
I think that the most important thing is whether you have enough basis to believe that the religion is true; and from my research so far I don't have any reasons why Christianity wouldn't be. Though there can probably never be complete sureness as long as we live here.

Umm Luz? I thought that questions and doubt were the exactopposite of faith. Also, you seriously can't see any reason why Christiaity wouldn't be true. Realy?

Yes I agree with Alex here. Though with the last part about stories changing over time, with the New Testament it doesn't apply because already a few weeks after the Easter event the apostels went and preached about Jesus and about having met him after his ressurection. Since the body was never found, the authorities couldn't provide a proof against them, yet there was a risk of persecution from the authorities who didn't like that [and eventually it happened.] These people weren't just people who had heard the message through tens or hundreds of other people. They claimed to be personal wintesses of the events themselves; and either they really were or they just made it up. The decision is up to us.

And I think if you never have doubts/questions about your beliefs then your faith won't become as firm as the faith of those who had the doubts and have found ways to resolve them.
But if you have doubts with some specific parts of the religion you need to decide what to do about them - leave the faith, ignore the questions, or try to look for satisfying answers [like in prayer, talking to Christians who are more educated or experienced, or literature.] Different persons may have different issues with the religion - it's not only a matter of the religion itself but also the person and their way of thinking and feeling and what they're looking for in a religious faith.

Yes and because they started preaching and forming communities of believers so soon I believe that the system of beliefs stayed unchanged during those times, for the most significant parts. The gospels were written about the 60's - 80's I think. There are also the epistles that tell us about the beliefs of the first Christians, and they are older than the gospels by the way [40's or 50's.]