Better say they began in Asia (generally): Christianity, Islam and Judaism: West Asia Hinduism and Buddhism: South Asia Confucianism and Taoism: East Asia I think the answer doesn't primarily lie in the religions themselves, but in which cultures generally had the deepest influence on other cultures. The Indian culture had a profound influence on South-East Asia (and to a lesser degree on Central and East Asia, viz the spread of the Buddhist teachings in those regions), from Burma to Indonesia, so different kinds of Indian spirituality became deeply rooted there, especially before the later advent of Islam. The Chinese culture had a profound influence on the other countries in Eastern Asia, and to a somewhat lesser extent in South-East Asia.
Thus, Confucianism and Chinese (Taoist-influenced) version of Buddhism became totally dominant in those regions. Middle Eastern culture (Persian, Arab and others) had a profound influence on a vast area from Mediterranean Europe and North Africa to South-East Asia, and through Mediterranean Europe on the rest of Europe, and through Europe to America, Australia and actually most parts of the world. Since the Europeans had already adopted a West Asian religion they effectively spread West Asian religiosity all around the world, even if it was considerably Europeanized by then.
Of course the Africans, Native Americans, and so on, had their own religions and spiritualities - they just didn't have enough global cultural, economic and military influence to spread it around the world. One interesting detail is of course the fact that two of the three greatest and most widespread religions were virtually wiped out in their original homes (Buddhism in India and Christianity in Palestine) but was still flourishing and spreading wide in other areas, by other peoples. The same is partly true with Islam, which was for centuries stronger in Persian and Turkish (and later Indian) regions than in Arabic, and is still much more numerous in South-East Asia than in West Asia.
No. It's all about connection and communication of civilizations that let these religions to spread. S/N America might have great people too but long forgotten.
Yet, it's up to what you believe in.
I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.