A scriptural belief-tribe is one which holds that certain writings represent infallible truth received from some higher being or plane of existence. These writings are generally called scripture, and the sets of beliefs subscribed to by these groups are called religions or faiths.
It should be noted that simply believing in the truth of scripture (whether literally or metaphorically) does not automatically equate to membership in a scriptural belief-tribe. The latter will often stridently profess adherence to scripture while actually cherry-picking it to support their tribal belief system.
There is ongoing conflict globally between scripture-tribes with differing sets of beliefs (due to different scriptures being followed) as well as between (on the one hand) scripture-based belief and (on the other) evidence-based belief (i.e. science); at its core, this conflict is essentially between authoritarianism/tribalism and individualism (or at least anti-authoritarianism); see reason vs. religion.