I am uncertain as to how mystery is removed by creed, dogma, and tradition, but as a general response - the Christian faith is often spoken as a Way of Life. We grow into persons who follow Christ, and this is a dynamic process, and it is within this context that we may understand creed, dogma, and tradition. Most of the denominations (or at least those I may have come across) agree with a Way of Life, and evangelicals often talk of ‘born again Christians’. Thus, we have similar outlooks in many respects. I view the Christian context as based on, derived from, and referred to, Scripture.
By dynamic, I mean that each member of the congregation undergoes change and growth in understanding, behaviour, and faith. The creed and tradition, and authoritative teachings, are provided to the Church for that reason. Thus, Orthodoxy as I understand it, encourages questioning, discussion, and even disagreements if these involve searching scripture and further study, especially Patristic writings (a great deal of dogma is the result of extensive discussion and writings). All of these aspects become complicated and can cause friction if some in the congregation are not motivated by a search for truth, but instead are greedy, envious and seeking self-promotion.
A general discussion would show that over time denominations used creed to distinguish themselves from other denominations, and the various practices became traditions for them. Wikipedia provides:
A creed , also known as a confession of faith , a symbol , or a statement of faith , is a statement of the shared beliefs of a community (often a religious community) in a form which is structured by subjects which summarize its core tenets.
The earliest known creed in Christianity, “Jesus is Lord”, originated in the writings of Paul the Apostle.[1] One of the most widely used Christian creeds is the Nicene Creed, first formulated in AD 325 at the First Council of Nicaea. It was based on Christian understanding of the canonical gospels, the letters of the New Testament and, to a lesser extent, the Old Testament. Affirmation of this creed, which describes the Trinity, is generally taken as a fundamental test of orthodoxy for most Christian denominations, and was historically purposed against Arianism.[2] A shorter version of the creed, called the Apostles’ Creed, is nowadays the most used version in Christian services.
Some Christian denominations do not use any of those creeds.
Dogma pronounces authoritative teachings. From the internet: Dogma became the traditional term for truths believed to be indispensable to the Christian faith. The question of what precisely counts as dogma is bound up with questions of pronouncement and reception. The most widely recognized source of dogmatic formulations is the ecumenical or general councils of the church, but Christian communities vary in the number of councils they recognize as ecumenical. Short of dogma, considerable authority accrues to broad patterns of stating and practicing the Christian faith that have maintained themselves over time and space. They appear comprehensive and coherent, even though minor shades of difference are not excluded from their expression.
The Eastern Orthodox churches detect a “common mind of the fathers” ( consensus patrum ), which allows for some variety of contribution and emphasis among the Fathers.
Christian tradition is a collection of traditions consisting of practices or beliefs associated with Christianity. These ecclesiastical traditions have more or less authority based on the nature of the practices or beliefs and on the group in question. Many churches have traditional practices, such as particular patterns of worship or rites, that developed over time. Deviations from such patterns are sometimes considered unacceptable or heretical. There are certain Christian traditions that are practiced throughout the liturgical year. Tradition also includes historic teaching of the recognized church authorities, such as Church Councils and ecclesiastical officials (e.g., the Pope, Patriarch of Constantinople, Archbishop of Canterbury