So, Big Bang is your current belief, but it could be wrong in 100 years and people 100 years form now will be going, "Can you believe those idiots believe din the Big Bang? LOL!"
One hundred years ago, everyone believed that there was only one galaxy in the universe. We now know this to be false. (Very false.) I am not aware of anyone who believes that astrophysicists from 100 years ago were idiots. They drew the logical conclusion from the information available to them, and when new information became available, they recognized that the conclusion they had drawn was incorrect and discarded it.