As far as I know, no religion approves of murder.

There has been a large number of religions which approved of murder. There have been numerous historical religions which demanded human sacrifice.

Many atheist systems of belief justify murder. This last century has seen the slaughtering of people by the hundreds of millions based on people's belief system. Books like "Death by Government" tally up the carnage. It is really scary.

There is something wrong in the head of Putin which makes him think it is okay to kill Ukrainians. Advocates of abortion kill the pre-born by the millions.

The belief system of radical environmentalists says that we have to reduce the population to save the planet. China had the one-child rule which comes from their belief system.

The power mongers of the world are adept at finding ways to use religion (and anti-religion) to justify murder.