I feel no necessity for doctrine. But without Bible teachings or doctrines, religion becomes an affair of the feelings. Doctrine has been abused.
Men play with doctrine as something that belongs to the intellect rather than with life.
Then people are likely to adopt only what is convenient. Men do strive about doctrine and creedal statements. They get into controversy when others hold religious opinions different from their own. The tendency then is to alienate people. So people come to believe that the best thing to do is to stress Jesus and de-emphasize doctrine.