Kingdom Entrance (Matthew 21:23-32)

Christ returns to Jerusalem after cleansing the temple and cursing a tree.  He is going to face the leaders of Israel and we can imagine that this is going to be tense.  Christ tells them that it is the prostitutes and the tax collectors who enter into the kingdom of heaven.  Does this mean that in order for us to gain entrance into the temple that we have to be a tax collector or a prostitute?  What is the point of Christ calling this to the leader’s attention?