He actually has I believe, the Catalan Dragons HC (I think) explained that they had spoken about it and felt that it was a religious decision (that one should only take a knee for ones wife and God) and is a sentiment that has been echoed by a fair few Christians (a black basketballer did it just yesterday I believe).
We can get into a debate about kneeling and whether it's a meaningless gesture that has done more to harm the cause than good if you like but I fear that your mind is already made up on that.
Members of my (mixed race / north African ) family have been asked to kneel for various social media and publicity events recently but time and time again, have said no. None of the reasons for saying no were because they were racist and the suggestion that not kneeling = for racism is abhorrent.
Furthermore, in those first few lines of your post you seem to be making the point that kneeling is essentially a flippant gesture that, to paraphrase your argument, you should do just because everyone else is doing it and you don't want to stand out. I'm sure the irony is not lost on you there...
I, as a Christian, deeply disagree with Folaus views on homosexuals. Do I think that automatically makes him a racist? No. Might he be? Yes. Is there any evidence whatsoever that he is? Not as far as I can see, but absolutely feel free to correct me if I'm missing some.