Yes, any proto-whatever theory is colonialist in essence. It’s a very heated argument in anthropology, sociology and social psychology. The current consensus is that it is only valid for the indo-european migration, and a version exist for the proto-sino-tibetan migration. But, we understand that it can only be claimed to apply thus far, and with all sorts of modern ideological biases and caveats. Both language and religion are extremely complex social phenomena that have independently appeared all throughout history. And every time they have their very unique and distinct qualities. There’s no unified tree of languages that has enough evidence to be authoritative. And there’s no such linear derivation equivalent for religion. It is all just pop-sci feefees.