Creative Speculation

Organic matter that decomposes in air does not turn into fossil fuels. "Biogenisis" of fossil fuels begins with decomposition by anaerobic bacteria, so the organic matter first needs to be buried so it's not exposed to air. That would be the result of relatively infrequent catastrophic events such as flooding, not a daily process. But even if we assume it's more or less continually happening somewhere on Earth, there is no justification whatsoever for your claim that it's happening faster than we are extracting it.