Islamic scholars consulted by a leading producer of cultivated meat say that the newfangled protein — which is grown from animal cells and doesn’t require animals to be slaughtered — can be halal, or permissible under Muslim law.
And the Jewish Orthodox Union this month certified a strain of lab-grown chicken as kosher for the first time, “marking a significant step forward for the food technology’s acceptance under Jewish dietary law,” as the Times of Israel put it.
Would be nice to know, I’d like to read a source. On wiki, I got the impression the driving incentive is not to kill less calfs, but to produce more rennet, to ultimately produce more cheese. The German wiki quotes “Nur ca. 35 % der weltweiten Käseproduktion können mit Naturlab produziert werden.”, roughly “Only about 35% of worldwide cheese production can be produced with rennet from animals”. Technically still a vast majority.
It was from Wikipedia, and I was misremembering slightly - not 95% of all cheese, but of cheese made in the US. Which could be saying a lot about cheese in the US.