Please only answer if you have bible knowledge .?

Adam and Eve had other children aside from Cain & Abel and somehow miraculously, they were able to breed like rabbits, by the time Cain was ousted and then married to another woman who was probably his sister or aunt. Amazing how things happened in such short time periods in the bible. Kind of like how Noah and his family were able to find all the materials for that huge ark, then cut them, build the ark, find all the animals God wanted, then to fill it up, make sure the animals don't eat each other on their long voyage trip, find food to last them for this period, all in the time of their life, with only 4 persons to do this job. Purty incredible. Or insane thinking.