Water is older than mankind or animals and water is needed for life. This why we search for water on Mars, for example. If we find water there could have been (or be) life as we know it. It follows that the first lifeforms came out of the water and then onto land. Mankind as we know today is not necessarily a fish nor an ape. It's just that life came from the water and fish of some sort were before us. We are hominids and so are the apes. It does not mean we came from apes but rather means we are in the same family as apes. Way back in time somewhere we all could have been closer in family to a fish.

The strange thing here is that creationists want us to come from 2 people, - Adam and Eve. It would mean that we all got here from incest and this was why people lived so long way back then to populate the earth. This is also why you need god and were born sinners. Incest must be a part of his perfect plan. People ask which came first, the chicken or the egg? Evolution is slow and doesn't work that way. We might as well ask how disease germs got here and was there a "first disease germ?" Let that idea play out the same way you would with biblical creationism. The thinking mind says we humans are not a disease germ but the Cosmos does not make that distinction. It really doesn't care.