They can modestly increase blood sugar levels which can be enough to tip people from having borderline diabetes levels up to having diabetes diagnosis levels.
I was prescribed statins and if I take them continuously i.e. every day I see an increase in my fasting blood sugar. I only take one or two a week (10 mg) otherwise I have to up my basal rate. From my own personal experience I believe they can cause insulin resistance.
I found high dose artichoke tablets and margarine fortified with plantoids really helped to lower my LDL cholesterol significantly, so that's my strategy and it works.