You don’t have to see something being made to believe someone made it. You can tell from the complexity and patterns if there was someone behind the making of it.
Chance and billions of years could not create the complexity of snowflakes let alone the whole universe.
Whether God, some god or aliens, someone had to have made it.
For since the creation of the world His invisible attributes, His eternal power and divine nature, have been clearly seen, being understood through what has been made, so that they are without excuse.
Romans 1:20