Step 1: Understanding Tagore's idea.
Rabindranath Tagore, in his vision of spirituality and humanism, proposed:
- The Religion of Man as the idea that the true essence of religion lies in human values and not in dogmatic rituals.
- His view emphasized the universal connection among human beings, promoting peace and harmony.
Step 2: Conclusion.
The correct answer is 1. The Religion of Man.
Final Answer:
\[
\boxed{\text{The correct answer is 1. The Religion of Man.}}
\]