Without them for energy? Yes.
Fossil fuels are far more important as fertilizer and medicine than they are as energy products. We can, fairly easily, replace them as energy sources with alternatives that may be more expensive but are viable.
We don't have shit for a way to replace the fertilizer supply, which means we'd probably have a great dying due to starvation if we completely abandon fossil fuels.
Then of course theres all the medicines we make from oil. If the starvation dying doesn't get you, the lack of medical supplies is going to curb another large portion of our population.
... in the short term
The bigger question is what it would take to get us back to the point where we *can* get to those petrochemicals... where we can build the machines we can build today.
Infrastructure is a big worry, and societal collapse... but if we could magically turn people into a well-organized, forward-thinking group I assert we could get from there to here pretty quickly.
Electricity is quite doable, though not to modern levels, without modern resources. Electricity gives you the ability to make the machines that will make the machines.
Electricity also gives you biodesil (though yes, that will be competing with food crops as, yes, starvation and disease will affect many, many more people).