my question is astronomical observations and results thereof when applied to humans largely differ from astrological influencing. What Buddhists unlike other religious groups should do to solve the problems?

Buddhism originated in India but from what I understand it's not very big in India and instead more popular in Eastern Asia in countries like Japan, Vietnam, China etc.

Mappō (a.k.a mòfǎ, mạt pháp) is a term used by the majority of Mahayana Buddhism branches in East and Southeast Asia. It was mentioned in the Mahayana Mahaparinirvaṇa Sutra, signalling the declination of Buddhism and corruption of society as a whole. The sutra painted a grim picture of Buddhism's future, where monks violate the precepts and preach a perverted version of the Buddha's teaching. Most of the times where this concept is mentioned, it is to achieve political purposes, e.g to gain legitimacy by demonising other people or sects. This has happened since more than a thousand years ago, in ancient China, Japan, Korea, Vietnam, and is still going on. Personally, I found the concept and its details unhelpful since it gives practitioners (especially beginners) the feeling that the world is falling apart. I'd like know why such description is necessary for Buddhists to know, and what is the optimal way to address it?

What are some specific cultural aspects of different countries in SE Asia that are integrated into Buddhism, but that might not actually be consider purely Buddhism? In other words, comparatively, why is Buddhism in Thailand different than Buddhism in Cambodia. And what would the main differences be?

What the actual words or at least the structure of of the ceremony/ritual? I'm particularly interested from the Mahayana East Asian standpoint (Chinese/Korean/Vietnamese/Japanese) However, I don't speak or read any of those languages. It may or may not be relevant, but I have a Samantabhadra, Kwan Yin, Medicine Buddha and a Shakyamuni statue.

I found many personal book about Buddhism; witnessing; life story; spiritual encounter, experiences, meditation. I never found however a book that explain and summarize the classical Buddhism : a consensus clear that none Buddhist can read to understand that philosophy better.

Which are the major sects of Buddhism in Singapore? Which are these sects' main temples in Singapore?