I think that tribalism expands to cover any differences. Some experience among various Orthodox Jewish groups is one piece of information in my background. Ideological divisions are unimportant within a group half the size of a congregation and important within a group the size of a congregation, regardless of the ideological diversity in the congregation.

Mothers can tell identical twins apart. Anything less than an extreme reduction in differences won't do much to reduce Schelling point in-group/out-group division.