Einstein's equation has been used incorrectly because it is badly written. This creates a lot of the problems in physics where questions conflict and others do not have answers.
Personally I believe in an infinate universe that expands at infinite speed. And that our phisical universe we see is not all of it.
What, precisely, does that mean? For example, if we look at a galaxy that is 300 million light years away, it is NOT moving away at infinite speed.
If one believes in an infinite universe then Einstein's equation is very simply disproven. You must only exist at the speed of light.
Which Einstein equation?
If a=b then if "a" is infinite "b" must be infinite or "a" does not equal "b" and the equation is worthless.
In Einstein's equation In an "infinite expanding universe". Energy would be infinite. If energy is held infinite the "a" must equal "b" lets consider "a" to be energy. We find on the other side of his equation "b" is mass times a "numbered constant" (the speed of light squared). Since mass can be infinite then to hold all "b" infinite it can not be multiplied by a constant. Therefore infinite "a" does not equal "b" or
Energy DOES NOT equal mass times the speed of light squared.
There is so much wrong with what you said here, I don't really know where to start.
First, E=mc^2 is the energy equivalent of a mass *at rest*. To deal with motion, you have to use the formula E^2 =m^2 c^4 +p^2 c^2.
In particular, it would not apply to the universe as a whole, which does not have a single rest frame.
Next, if energy is infinite and mass is infinite, then the equation E=mc^2 would work perfectly well mathematically. There is nothing wrong with multiplying an infinite quantity by a constant. You get infinity out from this calculation.
His equation in many instances is taken by physicists incorrectly. Yet it is still used today as if it answers everything. That is why the confusion.
Nobody says it answers everything. It just shows that mass and energy are two sides of the same thing.
So if you are trying to explore the possibilities of an infinite universe, dark matter, or anything that is outside the realm of light functions.
That sentence fragment makes no sense.
Einstein is a wagon going off a cliff. Jump on. Everyone else in physics and mathmatics is. For me I have a better answer and it expands to the infinite. I can explore all possibilities.
Those who claim that Einstein made some fundamental mistake usually ignore that many people since Einstein have looked at his work critically. They have improved it, extended it, applied it in many more situations than Einstein did, and tested it via observations.
The actual math of special relativity is quite elementary, only involving basic algebra. To do general relativity, you need a lot more: at least multi-linear algebra, but it is better to have differential geometry.