Over the years I've heard much said about how important is to believe the "foundational" beliefs. Here is an example1.
I think that they have that all mixed up. Jesus say, "the greatest command is Love... the brothers". People are so quick to argue and expound on a variety of topics, such as, the Trinity, The Rapture.... etc. And yet Jesus said that Love was the most important. What difference does it make if we have different beliefs about God, the Holy Spirit, the Trinity, Justification, etc. People who are growing are going through a process of learning new ideas and beliefs. Their ideas and beliefs with change, grow, and expand as they begin to mature over the years. If we don't have love, we don't have anything. Love is the important thing, Love is the foundational belief, not all those other doctrines.