This is not true. Religion has caused many, many atrocities, but the religious texts and teachings rarely call for this. The institutions built around the religions have been the main issue over past centuries.

Many religions teach people that there are things more important than your own life, and this can be a good concept. Taken scientifically, you could use it to mean the survival of the human race is more important than your own, or "The needs of the few are outweighed by the needs of the many". The problem is that arbitrary lines and judgements do, and always have caused inequality. Even these innocent sounding principles can (and have been) subverted to cause great harm in the past.

Religion is also a deeply personal thing. If one person believes that "God hates <type of people>", then if you tell them their view of God is wrong, they will often object. It's a personal view that people will often believe cannot be wrong, because its their own connection to God. This is not true of every religious believer. Many will be happy to debate their religious views with you, and "Bible Study" is one very US-centric example of these debates being had on a weekly basis, all over the country.

Religion can enable some of the worst traits in people, but it can enable the best as well. It can cause people to give without thinking for themselves, to help out where others wouldn't, and to provide help for many. To give you modern day examples - the kitchen of the Sikh Temple in Delhi feeds thousands (perhaps hundreds of thousands) of people a day. Many of whom might go without, if it were not operating. There are countless trips/expeditions sponsored by local religious groups to help build/maintain things like schools across the world.

In the outbreak of catastrophe, religious groups often reach out and are some of the first responders to help - looking back to Hurricane Katrina in 2005, I know that local churches were responsible for helping many in need. I know that there are plenty of areligious organisations that also help in such crisis, but that does not diminish the hard work of the religious ones.

Obviously, religion is not always a positive. In fact, most religions have at least a few dark times in their history, but Reddit loves to jump on the "Religion is bad" wagon without much nuance. Many religions either are, or have committed many atrocities, but much like people, tarring them all with the same brush is to do the many decent religious believers a huge disservice.

Religion can be a poison, but it can also be a tool for self-improvement and reflection.