We're playing god now..
Because the embryos combine sperm and egg from the biological parents with tiny battery-like structures called mitochondria from the donor’s egg, the resulting baby has DNA from the mother and father as usual, plus a small amount of genetic material – about 37 genes – from the donor.The process has led to the phrase “three-parent babies”, though more than 99.8% of the DNA in the babies comes from the mother and father.
"Playing god" used to be a bad thing. Even secular types would chastise you if you talked about modifying humans like this back when I went to school.
And now we're just modifying DNA in humans as though we're the Almighty. No limits, no breaks, no ethical conversations, just do it because we can.
This is the definition of "road to hell with good intentions". You don't need to be a believer in religion to believe in a line, and see how we crossed it.