Final answer:
The concept of universal priesthood in Christian tradition suggests that through baptism, all believers are united in the community of faith and share in the priesthood of Christ.
Step-by-step explanation:
What unites you to the community of faith and gives you a share in the priesthood of Christ is the concept of a universal priesthood, as espoused by the Christian doctrine. Baptism, according to Christian tradition, is a fundamental sacrament that consecrates one into this priesthood. The idea is supported by scriptural references such as 'Ye are a royal priesthood, a holy nation' (1 Peter 2:9), signifying that all baptized Christians share in the priesthood and can perform certain religious duties, such as preaching and administering sacraments, especially in situations of necessity. However, the formal ecclesiastical structure would typically involve specific ordination through holy orders for one to assume official clerical duties within the church. In essence, the universal priesthood suggests that all baptized believers are spiritually united in Christ and share in the benefits, responsibilities, and mission of the Church.