You are avoiding the issue of numbers, history, and efficiency.

We already have several holidays, many non religious, and every time someone suggests another, the issue of lost work time comes up. It is well know that in societies where life revolves around religious festivals, life is organized very differently than in efficient industrialized countries, and not very efficiently. We cannot organize life here around religious festivals.

Second, holidays reflect a country's history, and population. In Asia, there is a long history of Muslim, Hindu, Buddhist and Christian cultures, and conflict between them, and large populations of these. In Indonesia, Bali is Hindu, and very nervous about being part of a majority Muslim country. It has not always been harmonious there either, and fundamentalists are gaining ground. The government has to be very careful.

We do not have that long history with those other religions, and the numbers are still tiny.