The Catholic Church has just
revised the list of mortal sins. Among new things which damn the sinner to Hell for all eternity if not absolved is engaging in "manipulative genetic science", i.e., modifying genetic material. To be fair, the Vatican did just erect a statue of Galileo, the scientist they forced on pain of death to recant the theory that the earth went around the sun, so they're not
entirely anti-scientific; they just like their science to mature for a few centuries.
Other things Catholics may not do without risking eternal damnation include abortion (natch) and paedophilia, taking or dealing drugs (presumably not including socially acceptable ones, such as alcohol, nicotine or caffeine) or "the excessive accumulation of wealth by a few" (that's a few individuals, not the Church itself).