Most famous scientists and thinkers of the world believed in Advaita Siddhanta. They have stated unequivocally that this universe is all one.
Astronomer and thinker "Carl Sagan" was a Hindu believer. Robert Oppenheimer, the inventor of the atomic bomb, believed in the Gita and studied Sanskrit to understand it. Erwin Schrödinger, Werner Heisenbaugh, Nikola Tesla etc. were also inclined towards Hinduism. Many Western writers and thinkers like Altus Huxley, Arnold Toynbee and Voltaire Will Durant were inextricably linked to Hinduism, and were devoted to it.
Tolstoy, Albert Einstein, Bertrand Russell and Bernard Schwartz have all praised Hinduism. But those who read a single book like the Bible and the Qur'an and get their head high, despise the Hindu religion. Maybe they all think like that because they have heard about thirty three thousand gods. Those who do not even understand what is the essence of Hinduism should do a deep study of Sanatana Dharma.