I think the proper way to compare bike and car fatalities is to compare deaths per mile traveled or, as this article does in a charming way, deaths per hour.
https://chessintheair.com/the-risk-of-dying-doing-what-we-lo...
https://chessintheair.com/the-risk-of-dying-doing-what-we-lo...
If bike vs car choice is confounded by route safety, deaths per distance or time does not tell you anything useful about whether switching will make you safer.
Railways and busses are a lot closer to airplanes in statistics then cars https://injuryfacts.nsc.org/home-and-community/safety-topics... so going car less is probably the single biggest improvement we can make to transportation safety.