Evolution or creationism?

why do people believe in evolution when there's no proof, and dismiss creationism for the same reason,im not talking about changing the colour of a moth or selective breeding of dogs so they have floppy skin on there face, im talking about the development of higher forms of life from simpler forms (ex. tube worm becomes Amphioxus which becomes a bony fish which becomes an amphibian which becomes a reptile which becomes a mammal, etc. also includes biogenesis (living cells from nonliving reactants)