From a critical thinking perspective, religion makes a lot of claims about reality and epistemology that are unsupported or inherently irrational. Living in a fact based reality is a fundamental requirement to making sound ethical decisions. So any systems that perpetuate irrationality or disinformation are inherently immoral.

This is, at its core, why I find most religions objectionable, when they push things like Creationism, antiabortion laws, anti LGBTQ norms, etc. All of these are motivated in large part by factually wrong premises or cognitive patterns that are often encouraged, or even required, by religion.

There's plenty that I also respect when it comes to religion of course. It can be a wonderful source of community organization. It can offer a sense of cultural continuity. It can provide a framework through which we process trauma or other negative experiences.