The answer depends on one's definitions of an atheist person and a religious person. The confusion has to do with many atheists, having had previous religious training as children, but chose, as an adult, to become defined as atheists. If such people do good they are called atheists by the atheists and if they do bad they are called religious by the atheists. Stacking the deck with dual standards adds to the confusion.
For example, Dawkins who is often considered a poster child for atheism, is self described, in his biography, as having been brought up as an Anglican. Later in life he became an atheist. Hitler was raised as a Christian, but later in life Hitler believed in social Darwinism; superior race, which was an atheist concept. These two men are treated with dual standards by atheism. They atheists will own up to Dawkins, even with his early religious upbringing, but not Hitler, even though both men found atheism later in life. The math becomes fudged.
If you look at life on America, the left, which is less religious, than the right, sides more with atheism. It is far less tolerant and had more violent demonstrations in 2020. They are more likely to censor free speech, force conformity and become vindictive. This will be blamed, by atheists, on early religious training, like Hitler, and not choices as adults, like Dawkins.
Most of the violence in America's large inner cities is connected to atheists; the criminal godless, who are not officially card carrying atheists. They may have started out with basic religious training. But in the end, one can tell a tree by the fruit it bears. The violence is not about love or self defense of others, but about criminal behavior for self enrichment and clans; drug and gang wars. That is not taught by religion.
Based on these observations, I tend to believe the worse offenders are those whose belief systems are conflicting hybrids; have both conflicting religious and atheists leanings. These tend to be the worse, since they are often in conflict, while lacking the reliable moral restrain. For example, in America, the talk of reparations for blacks, by the left, is an atheist spin off from the religious concept of original sin. Just as in the story of Adam and Eve, future generations beyond the originals, are somehow assumed scarred and liable, for the past, independent of their own actions. This is how the conflicted hybrid minds think. They used calculated bastardization of religious doctrine for atheist-religious manipulations. This can rally other hybrids, since it appears to bridge the chasm of doubt
If anyone remembers the Russian Collusion Delusion in the USA, from 2016-19, this is where all the senior level leaders within the Democrats party, conned and lied nonstop, for three years, until the lies were exposed. Then the lying was buried, like it never happened. Pelosi and Schumer, to name the top two con artists of that era, are often labeled as Catholic and Jewish, respectively. However, both bastardized the truth, based on self serving calculations not in their religions. They are hybrids; wolves in lamb's clothing. They are the worse and give a bad name to both the true atheists and the true religious, who are far less conflicted.
When I became a teen, I was inhibited by my early religious training as a child. This initially prevented me from participating in the wild times of the 1970's; sex, drugs and rock-n-roll. Since I wanted to participate, I decided to become an atheist, since this was more conductive to those ends. The godless could dive in the deepest. In my hybrid, the ends could justify the means, instead of the means being censored up front by moral law. I justified the immorality as being part of a useful learning experience. However, I could only go half way; some inhibitions remained. This was the place I needed to be. Later in life, this center translated to the goal of finding how these two orientations could unite. In the end, religion is about the needs of the inner self, while atheism is about the needs of the ego. Both are needed to feel complete and content.
