Final answer:
The correct statement that depicts current changes in the geography of religion is that religious revivalism is a new global trend.
Step-by-step explanation:
The correct statement that depicts current changes in the geography of religion is c) Religious revivalism is a new global trend.
Religious revivalism refers to the resurgence of religious beliefs and practices, often accompanied by an increase in religious fervor and devotion. This trend is observed globally, with examples including the rise of Islamic fundamentalism and the growth of evangelical Christianity in various parts of the world.
Contrary to option a), religious diversity is actually increasing globally, with the coexistence of different religions in many regions. Option b) states that secularism is on the decline in Western countries, which is incorrect as secularization is a growing trend, particularly in developed nations. Option d) is also incorrect as religion continues to play a significant role in geopolitics, as can be seen in various conflicts and geopolitical dynamics influenced by religious factors.