Final answer:
Religious reform shaped relationships between different Christian communities by causing theological differences, schisms, and the formation of distinct Christian denominations.
Step-by-step explanation:
Religious reform, such as the Protestant Reformation in the 16th century, had a significant impact on relationships between different Christian communities. The reform led to theological differences, schisms, and the formation of distinct Christian denominations. This resulted in divisions and sometimes conflicts between the different groups, as each believed their interpretation of Christianity was correct.