Anoher way to look at dogma and doctrine is that there are some matters for which evidence is impossible, so the Church must prayfully come to agreement and once agreement has been reached, it is binding dogma unless a different agreement is reached. This is the case in matters of the Trinity, etc. Teachings about human nature, however, must be based on evidence and scientific understanding rather than reasoning from first principles. Sex, marriage and especially gay marriage fall into that category, as does the worthy reception of Communion (if you receive and you experience grace, your sin cannot have been great OR the teaching on what is unworthy is simply wrong).