Step 1: Reading the clue:
Two clues are given. The word we want must be the reverse of religious chauvinism, and it must not mean being against religion.
Step 2: Name the clue:
Another word for religious chauvinism is communalism, the belief that one religious group is superior and others are rivals. So the opposite idea must be one that treats all faiths with equal respect.
Step 3: Test option 1:
Communalism is the very thing described, not its opposite. We remove it from the list.
Step 4: Test option 2:
Secularism treats all religions equally and has no hostility toward any of them. It satisfies both clues, so we keep it.
Step 5: Test option 3:
Regionalism is about loyalty to a region and does not deal with religion. We remove it from the list.
Step 6: Test option 4:
Nationalism is about the nation and not about religious feeling. We remove it from the list.
Final Answer:
Only secularism fits both clues. \[\boxed{2}\]