One thing to remember is the extreme lengths of time we are talking about. The earth was formed around 4.5 billion years ago. The earliest life forms we have reliably dated showed up around 3.5 billion years ago. So roughly 1 billion years elapsed between the earth's formation and the fossil record containing life. The dinosaurs existed 230 million years ago until 63 million years ago. With that kind of scale of time, and planetary conditions we have never experienced, to completely dismiss abiogenesis as impossible is most unscientific.
Science doesn't even have a plausible explanation, let alone a valid theory, for how it might have happened. No matter how hard they try, they haven't got a clue. Real science says it's highly improbable, if not impossible. Remember what I said about information theory? Nature is not capable of creating the information content of DNA. DNA is a high level language. It works just like a computer. It accepts input and produces output based on it's programming. It controls every one of the thousands and thousands of processes of the cell. Now, do you have an explanation for how this could happened without intelligent design? Didn't think so.