Hi anasunakmoon -
Your profile says that you are in Egypt. It also says that you are 1012 years old, so I am not certain whether one of both of those statements are a misrepresentation, but for the sake of argument, I am going to assume that the first statement is true.
Your Egyptian ancestors worshiped the sungod Ra, who carried the sun across the sky in the daytime, in a sunboat, and then, after a serpent ate his sunboat, he battled his way through the underworld at night. Each night, he was victorious in the underworld, and each morning he got a new sunboat to carry the sun across the sky.
Your Egyptian ancestors did not know that they resided on a globe that orbited a star. Scientists have now proven that we live on a globe that orbits a star. And I "believe" them. I suspect that you do too.
All ancient societies came up with explanations for the events in the world around them that they did not understand because they did not have the science to adequately understand their environments. And all societies came up with creation stories about how the world and the things that we can see in the sky, came to be. Born out of an ancient egg. Spit out of the mouth of a deity. Created in seven days by a deity who spoke magical words. Dismemberment of a primordial being.
We now know so much more about our planet, our solar system, our galaxy and our universe than the people who created those myths. We know none of those myths are true.
But humans are curious creatures, and we want answers. So the world's most talented scientists continue to ask questions and seek answers. The evidence collected over literally billions of hours of observation and study by countless specialists in a wide range of fields over multiple generations, points to the Big Bang.
It is not a simple answer. There are many outstanding questions about the origins of the universe, and in future generations, countless scientists in a wide range of fields will continue to study, and make observations, and test hypothesis, and form theories, and test them when possible, and share observations across areas of expertise, and billions of hours of human research and labor will be added to the pool of knowledge that already exists.
Some aspects of existing theories will be confirmed, while other components of those theories will be challenged and revised or thrown out completely as evidence is examined, over and over again.
It is possible that during this process of research, the scientists will find irrefutable evidence of a sunboat eating serpent, or a deity who spoke magical words and created a light source for earth before creating any stars, including our own.
But I'm guessing that the evidence will drive the research in another direction.