Even from the biblical account of creation,God never created everything to be equal, he made some to be big and some small, man over woman and so on. The society is built on a social strata that has a hierarchy of three, the upper class, middle class and the low class. Non cam function without the other.
A practical question that can fix the deliberation concerning equality is "If everyone becomes rich who will serve who?".just like there will be no driver nor taxi, no clear I'm any where, you cannot employ me I can not employ you.
So life is just not supposed to be equal, it's natural that one should be bigger at some point that that has made the society to last long. There most be a class of followers and leaders.
I am not a socialist nor a communist, but I have read a bit about the works of Marx and Engels. When you talk about the upper, middle and low class, you must be aware about the way socialist and communist see that system.
In the eyes of communists, the middle class does not actually exist, there are only two classes within society: the capitalists, who hold the means of production and the working class, who do not own the means of production and sell their work force. Both the low and middle class do the same to survive in the capitalist system: to sell their workforce.
Regardless of what you think of it, since we are talking about equality/equity, I thought it would be interesting to point that out.
Also, I have seen people who are communists to claim the bible actually has passages which are quite similar to the ideas of communism, alledgely God instructed the people of Israel to collect the mana in the morning (during their travel through the desert) to do so in a manner which anyone would be fed according to their needs, and collect according to their capabilities.