Your question is confusingly written: do you mean 'differences in ideologies' or 'differences in level of commitment to ideologies'? Or perhaps something else even?

Unless you historicize the question, whatever the question is you may have more success with it over at /r/AskSocialScience or even /r/AskAnthropology.

Could you expand on what you mean by ideological certainty? I googled the term and it doesn't seem to refer to a specific academic idea or theory as far as I can tell.