Final answer:
The emergence of new Christian churches has had the most significant impact on the practice of Christianity since the standardization of Christian beliefs.
Step-by-step explanation:
The change that has most affected the practice of Christianity since the standardization of Christian beliefs is the emergence of new Christian churches.
After the standardization of Christian beliefs, different sects and denominations within Christianity emerged, leading to variations in practice, worship, and theology. This diversification has influenced the way Christianity is practiced and understood by different groups of believers.
For example, the Protestant Reformation in the 16th century sparked the creation of various Protestant churches, such as Lutheranism, Calvinism, and Anglicanism. These new churches introduced different theological doctrines and worship practices, impacting the overall practice of Christianity.
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