In Infinity War, just before he is killed, Loki says:
You will never be a God.
As far as I remember, I don't think Thanos has been portrayed as wanting to become a God in the MCU. I understand that he has a superiority complex that he is the only one who knows and understands what needs to be done, as well as it his burden to do what is needed but I would hardly call it a God complex. Even after he has performed the Snap, he destroys the stones and goes back to a "normal" life in the Garden.
So what Loki says, is it supposed to be a reference to something?