Good. What does credit have to do with veing a good or bad driver?
There's a legitimate reason for a credit check, if the insurer is allowing the policy holder to pay a monthly fee--which is effectively financing the policy. That being said, it doesn't always work that way in every state. If I understand Texas correctly, it's basically considered a renewing monthly policy. But there are other states where you're buying either a 6 or 12 month policy, and paying it off one month at a time with an interest fee (or you can save yourself some money and pay it up front). So, in theory, the financier can reasonably want to identify the risks involved in extending you a line of credit to finance your policy.
That being said, I don't know how this translates in practice. Nowadays credit agencies are deep in the big data hole, attempting to predict every last detail about your potential financial activity. They are generating several specialty "credit scores" that are tailored to different activities. There's one score attempting to predict your likelihood to pay your phone bill, your likelihood of switching carriers, so on and so forth. They even try to predict what bills you will prioritize if you experience financial troubles. So in the future, cell phone service providers may decide to refuse to provide you service if they don't want to deal with someone whose credit history suggests they'll prioritize paying rent over paying the cell phone if they lose their job.