Doctrine and dogma are important and have a firm purpose in most religions--after one has come to believe, doctrine and dogma define the parameters of that belief--they codify and crystallize what it is that one must believe to be a member of that faith. They define the community of faith--they tell the truths of the faith.
But too often it seems they become the end of the faith. Rather than believing in God or Jesus one believes the doctrine of the Church. One states a dogmatic creed that defines the contours of the story of the faith and sometimes the faith does not go below the surface of that creed. Doctrine and dogma are important, but they can become stultifying.
It would seem that the approach one should take in these matters is strive to understand the doctrine and dogma that define the faith and then, let them go. Don't worry about them--if you believe what is stated, then it seems best to turn your mind elsewhere and rather than worrying the details to death, arguing and apologizing, living your faith is the best exposition of it. The faith, if true, needs no defense. The errors of others are their errors and will either be remedied in time through deepening understanding, or will remain forever. Either way, arguing the matter isn't likely to change most people's minds.
A focus on doctrine and dogma is the surest path to losing your way entirely. It is the certain path of losing all compassion because one's obsession becomes being right rather than right action and right disposition. A good understanding of what one believes is essential, but a constant discussion of the fine points of the nature of that belief can be distracting from what we are called to in this life. Living a faith of compassion, loving-kindness, and caring for others and for ourselves.