With all the different religions out there how do you know yours is the right one?
Something like this can't be answered in a short space, because each assertion comes with it's own set of questions that will just depart from the initial question.
I'd start answering that question by saying that truth is exclusive, not equivocal. A lot of people, mostly detractors, like to think the Bible itself is open to interpretation, and any interpretation can be equally true. That's not the case, God isn't the great confuser of all things.
The case for Judeo-Christian faith is not man's interpretation of it, it's God's declaration of it. He does allow for your free will to suggest an interpretation subjectively, and all men are very subjective creatures. But all the suggestion in the world won't make an interpretation true. He also demands faith. Without faith, there is no pleasing God (The questions/accusations concerning this can become a novel in and of itself).
Other religions teach ethics, not theology. Man kinds efforts to reach God or Heaven, without really revealing anything about God. They teach man's works as a means to attaining God; they're told from the base point of mans efforts. They're man-centric.
Christianity is the acknowledgment of God reaching down to man. God can't be reached by any action of man, apart from God's revealing of himself to man. On the one hand, you have books of ethics and social morals, on the other you have the revelation of our creator, and the distinction of His actuality apart from the worlds idols.
No other prophet, Jewish, Muslim, Hindu, etc, could make the claims that Jesus made. From being sinless, to his resurrection, to being the actual God/Creator Himself made flesh.
I could go on...