For the average evangelical church in america the answer to the title question is no. That word mysteries, is in the latin sacraments, which is defined as means of grace. In other words baptism, the Supper and absolution. So western evangelicalism has turned these means of grace into nothing but traditions and do not even pronounce the forgiveness of sin, they are by default not being stewards of the mysteries. Because those mysteries are how God uses ordinary materials, water, bread, wine, and the voice of a fallible human man to administer grace.