If you believe in God and think that God exists in everyone, you must also see that not everyone reflects the reality of what God is to the same degree. For all people may be manifestations of God but clearly none are perfect manifestations which means there are greater and lesser manifestations.
If you don't believe in God but think that we all have some kind of universal spiritual component within us then you must still accept that our awareness and understanding of it differs hugely. As does our ability to express it.
And if you are a materialist then you believe that nothing has real meaning or value anyway (unless artificially invented by us) so equality is a redundant concept. It's merely an ideological abstraction, an aspiration without real substance. If a materialist wants to say that we all have equal value then that value, according to his scheme of things, is precisely nothing. We are all equal, but equally worthless.
Equality as a real thing rather than a vague abstraction is only possible in something like an ant colony. It would demand the complete abolition of individuality.
It is a materialistic perversion of a spiritual truth, namely that God does exist in every human being who, by virtue of that fact, all have the potential to awaken spiritually and become godlike themselves. But we are all at very different stages of that journey and some will never reach the destination. Moreover, even when the destination is reached, we will not be equal because we all express our spiritual realisation in individual ways.
Equality is a one-dimensional view of the world which collapses reality to the horizontal, the material level, ignoring the vertical axis of soul. The very concept should be rejected and replaced with ideas of justice and fairness where these are appropriate. That is because to keep equality in any form whatsoever inevitably reinforces the notion of equality pure and simple as an absolute.
How did this absurd idea ever come about when it is so contrary to reason? One can only assume that it is a misconception of Christian teaching, basing itself on the idea that all human beings have the divine within them and, in that sense, all have value and the same divine potential. But to go from that to a belief in equality here and now in this mortal world is an utter non sequitur. As my teachers said, "men are by no means equal on the earth plane".
Proponents of the idea perhaps think that without it the door is open for exploitation of the weak by the strong, but that is akin to saying that the idea may be false but it can have good results or that the means justify the ends which is an axiom any schoolchild should know to be false since a cause and its effect cannot be separated. There are other ways of preventing the abuse of a truth than by propagating a lie. Besides, this exploitation would only occur when the belief in human inequality was interpreted materialistically, that is to say, without the corresponding belief in God. The problem is not inequality but inequality seen through the lens of atheism or false spiritual beliefs which are grounded in worldly interpretations of spirituality. In all cases, the solution is a correct spiritual understanding that sees the presence of God in all human beings, but that presence existing as a potential that needs to be developed.
Equality is actually destructive to the understanding of God because, by limiting everything to the same level, it destroys a proper sense of hierarchy and transcendence. That means that God is reduced in majesty and mystery. In fact, ultimately, if you believe in equality you will eventually believe yourself to be equal to God. And that means you won't believe in God. But without God, as we can see quite clearly now, there is only nihilism and despair, kept at bay by the need for constant entertainment whether that be of the popular variety or the intellectual. Equality, far from being a spiritual belief, as it is often conceived of nowadays, is actually the product of a pure anti-spiritual materialism.
Once again we see that when humanity abandons belief in a transcendent reality it loses itself in invented substitutions that lead it ever further into illusion. And the end result of living in illusion is always spiritual disaster. This all stems from the replacement of true religion with the worship by humanity of itself and the failure to understand that if humanity does not look beyond itself for its true fulfilment it will quickly sink into something less than itself. Egalitarianism is actually all about the promotion of quantity to a universal good and the concomitant destruction of quality.
There is more on this subject in a previous post here.