Obviously leaving a religion would cause psychological issues. Losing one's parental support, or even being attacked by a parent causes trauma. Losing all the cultural and religious markers in your life is hard. You don't see that with those who grow up in atheist families https://twitter.com/incomingAR/status/1249033022210531332

It takes many people years to get over the trauma. Some are lucky, like myself, who face little in terms of personal loss by leaving the religion. I only lost my friends. But I was able to make new ones. Others have lost their wife, or kids. The worst off lose their lives.