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Seems to be mostly speculation by those who do not believe in a Creator.
So, the answer is that there is no proof of any way in which life originated. Now, the difference between science and religion is that religion assumes "God did it," and science says, "We don't know, but we will do our best to figure it out without relying on anything but what can be observed and deduced from observation." At the present time that investigation has borne speculation and hypotheses for testing.
The REAL difference, though, is that science finds "we don't know" to be a reasonable position as a starting point for investigation.
The ancient Greeks did not understand that the rotation of the earth caused them to face toward the sun at some times and away from it at others. So they attributed the rising and setting of the sun to the Titan Helios driving his chariot across the sky.
The Norse did not understand that occasionally the moon is in a position such that its shadow is cast across the earth, creating a solar eclipse. They attributed it to the god Fenrir swallowing the sun.
The scientific explanation for these phenomena came to be understood in time, making the ancient explanations seem rather silly to most people in the modern age. Your account for the beginning of life on Earth is no different. In short, the fact that we don't have a full naturalistic understanding right now does not mean that a naturalistic explanation does not exist...just ask the ancient Greeks.
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