One of my favorite quotes in the book actually comes from the preface, where Lewis explains that his purpose in writing the book isn’t to get people to join a particular church, but rather to accept the basic tenets of Christianity. To make his point, he describes Christianity as a hall with several rooms, and says that his goal is to get people to enter the hall, and to figure out which room to enter on their own.
On choosing which “room” to enter into, he says:
“And above all you must be asking which door is the true one; not which one pleases you best by its paint and paneling. In plain language, the question should never be: ‘Do I like that kind of service?’ but ‘Are these doctrines true: Is holiness here? Does my conscience move me towards this?’ When you have reached your own room, be kind to those who have chosen different doors and to those who are still in the hall. If they are wrong they need your prayers all the more; and if they are your enemies, then you are under orders to pray for them. That is one of the rules common to the whole house.”
I like that a lot.