We can see things moving faster than light

I stop at the mathematical conclusion that space can expand. There is no physical evidence of space expanding, beyond the assumption that Red Shift is purely a Doppler Effect. To which, there is plenty of evidence that justifies questioning this assumption.  And mathematical proofs are not evidence of a truth, but evidence of predictive usability. How did Ptolemy's Geocentric cosmology stay around so long?  It had usable mathematical models that predicted with some accuracy.  Thus math was used to support a false model.  Mathematics not based on physical evidence is science fiction. 

How do you justify your claims when the most prominent models in use(GR) are full of unknowns, mathematician's call constants and consider to be divine providence? I'm pretty sure Einstein was not a fan of constants and Newton, well, he derived the Gravitational Constant, he did so admitting no mechanism.  In essence, he derived a formula based on what he knew that revealed something he didn't know. To improve on Newtonian Gravity, according to Thomas Kuhn, would require not needing a mathematical constant.  Yet GR has a number of these mathematical constants, a number of, what I consider, gaping holes of ignorance. How do you accept GR as a valid model when it has so many gaping holes of ignorance?  

You know why it seems counter intuitive? Because its wrong. The same thing with gravity, if it were relative to mass, it would not require the gravitational constant to compute. Which is another thing, how come you cannot measure gravity, only calculate it? We got voltmeters, magnetometers but no gravimeter. 

I know I am asking you to question the alleged authority of some alleged experts, and most of you are simply not capable of thinking for yourself.  Odds are someone will tell me to believe just because everyone else does, thinking that is how science works. Don't bother for I will call you out for the mindless minion that you are.

Do you believe mathematical constants are numbers with divine providence or a gaping hole of ignorance?