> Am I wrong because even if you charge the batteries with power that comes from nonrenewable energy, its still more efficient, and in that becomes different from nonrenewable power?
this is an it depends.
The best combined cycle power plants are more efficient - even accounting for transmissions losses than an ICE. However there are a few power plants that are less efficient.
Coal is about equal efficiency to a ICE in the ideal cases for both. Running an ICE at ideal efficiency is unlikely though, while they manage coal to put close to ideal, though after transmission losses the difference isn't so great if you are doing highway driving (but city driving is vastly worse).
The worst case power plants are worse then city driving in an ICE. These power plants are typically mothballed, but they when there is an emergency. They are generally only used every 5 years, but they are a part of every power utilities emergency plans. As power demand goes up power gets less efficient in general, so Christmas season is going to be less efficient.
> Am I wrong because, in the U.S., its about 50/50 renewable/nonrenewable so the claim that your likely to charge your battery with nonrenewable energy is laughable?
This is wrong. US generation is about 20% renewable (as of last year) overall. Some areas have far more renewable than others (my utility claims >80% wind for me in marketing, but I cannot find and source that can be scientifically claimed). Some areas have far less. You may also count nuclear power as green even though it isn't renewable.
Most energy comes from non-renewables for sure. However that is overall and so your specific situation may be different.