Final answer:
Option A is the correct answer. Being part of a Christian denomination is seen as accessible due to the inclusive and welcoming nature of these religious organizations, shared beliefs and values that foster a sense of belonging, and common themes of universality and equality among believers which have historically contributed to the growth of various denominations.
Step-by-step explanation:
The idea that it is not hard to be a part of a Christian denomination can be understood by considering Christian denominations as large, mainstream religious organizations that welcome individuals without claiming to be official or state-sponsored. Different denominations, such as Baptist, Catholic, and Seventh-day Adventists, among others, share common beliefs and values that provide a sense of belonging, supporting the idea of an inclusive nature as stated in Galatians 3:28.
These denominations often emphasize universality and equality among believers, a concept originating from early Christianity's focus on spiritual needs and inclusivity, which can be seen in the generous membership growth of denominations like Southern Baptists and Seventh-day Adventists. While indeed there can be challenges such as differing interpretations and practices referenced in 1 Corinthians 12:12-14, the welcoming and inclusive atmosphere, along with the shared belief systems, generally makes it accessible for individuals to join and participate in a Christian community.