Many of the denominations in the Christian faith will claim to be the true one. The trouble is, none of them truly are. Each one can give you a piece of the truth that Jesus left for us, but organized religion as a whole has been changed by people in the name of "tradition". Tradition says we are right and anyone who does something different from us is wrong, thus the need to determine who has the right truth. We all need to be more open to understanding we cannot know everything about God, no one is right or true, and we all can learn from someone else.
To clarify for you, a religion is based on the God or gods they worship, a denomination is a sub group of a religion. All Christians worship God and Jesus, thus we are all one religion, but we do this in so many different ways and each of these is called a denomination. Curious what answers you get and the logic they use. :)