What difference does it make to you if the universe is cyclic or if it was spontaneously created out of nothing 14 billion years ago? Or if God created it six thousand years ago?
What difference does it make to you, in your life, if life started on Earth because aliens planted life spores here or if it was formed spontaneously in the sea somewhere?
Neuroscientists and Buddhists say that the self is an illusion. So what? Who cares? I mean, isn't everything an illusion? The material world isn't really material; it consists of mysterious electromagnetic fields, electron clouds, energy, and God knows what.
We are here, and we have to figure out how to survive, how to treat our friends and family, our neighbors, the animals around us, nature, and our planet. This is what is important.
Suppose you are a rich man, a billionaire. And the only thing you can think of to do with your money is to invest it in the stock market to get more money. Maybe you buy a mansion and fill it with art. At the same time, 150 million children globally suffer from chronic malnutrition. You are then a complete idiot.