Institutional racism is a metaphor. Remove the people, no institution, no views.
But we aren't talking about the views of individuals, but the culture, ethos, values, policies and practices of institutions and organisation.
So right back at you - remove the institution and there cannot be institutional racism etc.
That a dominant view held by people in power in an institution is not the view of the majority of members is about power, not the institution having views itself
But the institution or organisation may have embedded culture, ethos, values, policies and practices, which may not align with the views of those people who work for and/or are members of that institution or organisation. And it isn't as simply as glibly suggesting those in power in an institution can just change the embedded culture, ethos, values, policies and practices as they wish to align with their own views.
Many institution and organisations have complex constitutions, articles of association which cannot readily be changed at a whim to align with the views of the leadership. In many cases these will be establish specifically to make it very difficult to change them in the future. Indeed in some cases the embedded culture, ethos and values might be enshrined through the action of completely separate organisations - e.g. Royal Charter. So it simply might be impossible to change the embedded culture, ethos and values from within quickly, if at all.
This becomes more challenging still with religious organisations where there may be a view that the embedded culture, ethos and values are actually divinely inspired with no-one in the organisation feeling that they empowered to make any changes.
The overall point is that when individuals are acting on behalf of an institution or organisation (e.g. as an employee or member etc) they may be required to act in accordance with that organisation's embedded culture, ethos, values, policies and practices regardless of whether those values etc align with their own. Now this can be both good or bad or just different. But the point remains that the organisation's embedded culture, ethos, values, policies and practices are dictating the behaviours of those that work or interact with that organisation regardless of their individual views.
And where it is difficult (or even potentially impossible in the case of religion's baed on claimed sacred scripts) to change those embedded culture, ethos and values we have moved well beyond your simplistic notion that it is all about individual views and those in leadership within an organisation can simply change cultures to align with their views.