There’s one here by Bartowski:

[psychcentral.com]
It shows that apparently non religion raised kids do better academically.

In America it seems religion can lead to more social behaviour (inclusion one would think). But if it leads to conflict can have negative effects. (There are many studies on childhood trauma negatively impacting brain function, so this would be pretty normal). [sciencedirect.com]

ok well come out of her, my people isn't in there for nothing i guess then huh

As a Psychologist with well over 20+ years in the practice as both a Child/Youth in Crisis Counselor and Child/Youth Psychologist, I'd have to state categorically that there is NOTHING in religion/religiousness that is even remotely either beneficial nor advantageous to aiding the Mental, Physical, Emotional and Psychological Development of ANY child.
Nor does religion teach children the TRUE meaning of Altruism, Community, Individuality, etc, etc.
Religions such as Christianity and Islam, imo, seek to restrict, hamper and hinder, etc, the development/s of ALL things and replace them with a FALSE sense of security amongst those who are simply afraid to be themselves.

Studies do seem to indicate that non-religious children are more generous. Perhaps that's why so many of us support Medicare for all and those so-called socialistic governmental programs.

Another study listed right below the one on generosity from Science Daily explored the possibility that people with epilepsy are more likely to be religious.

This was quite interesting to me since I have two children one who is an atheist and one who is mildly religious. My daughter who is religious also has epilepsy. Her epilepsy was probably caused either by swelling from German measles contracted before she was old enough to be vaccinated, a birth injury because I did not dilate as fast as she was arriving or a fall from a van which was actually close to the same place in her skull that the misfires show up.

The reason you’re having a hard time finding them is probably because they don’t exist. All the studies I’ve seen show that religious people fare better.

During a recent conversation, I asked a friend if he knew of any scientific studies that support the idea that religion does more harm than good, and he sent me this wikipedia link [en.wikipedia.org] (which isn't about child development but) states the following:

"A metareview of 850 research papers on Religion in the United States concluded that "the majority of well-conducted studies found that higher levels of religious involvement are positively associated with indicators of psychological well-being (life satisfaction, happiness, positive affect, and higher morale) and with less depression, suicidal thoughts and behavior, drug/alcohol use/abuse".[77][78]

A review review of 147 studies[79] states that religiousness is mildly associated with fewer depression symptoms and that life events can still increase depressive symptoms.

In a metareview of 498 studies states that religious involvement in general is associated with:less depression, lower drug and alcohol abuse, less promiscuous sexual behaviors, reduced likelihood of suicide, lower rates of delinquency and crime, educational attainment and purpose or meaning in life.[80]

A meta analysis of 34 studies states that a positive relationship still emerges between religion and mental health even when using different conceptualizations of religiosity and mental health used in different studies.[81]

According to Robert Putnam, membership of religious groups in the United States was positively correlated with membership of voluntary organizations, higher level of commitment, better self-esteem, lower risk of suicide, higher life satisfaction.[82]

According to Pew Research Center's 2019 global study, when comparing religious people to those who have less or no religion, actively religious people are more likely to describe themselves as "very happy", join other mundane organizations like charities or clubs, vote, and at the same time were less likely to smoke and drink.

An investigation on subjective well-being representing 90% of the world population has noted that, globally, religious people are usually happier than nonreligious people, though nonreligious people also reach high levels of happiness.[84]"

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The horrifying thing about science is... it doesn't care what you want to believe.

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Here are a few...
[inquisitr.com]
[theguardian.com]
[dailymail.co.uk]
[theunboundedspirit.com]
[forbes.com]

The story of Abraham trying to kill his. Getting a knife thrust through your heart is bad for your development...

Religious children often become religious adults. Look how effing stupid and hateful many religious adults are.

Oh sure, it's so cute when a 4 year old says her prayers at bedtime but thirty years later, that kid has grown into a religious leader guiding policy at the federal level, brainwashing hundreds, maybe thousands more ignorant dumbasses to be as superstitious and intolerant as they are and getting rich off of that same ignorance.

Religion is a cancer. Don't let your kids get religious cancer.

Here is a study that shows children of religious parents are less interested and less literate in science.

[journals.plos.org];

The first question springing from my mind upon reading this was: What criteria do they use to evaluate what 'better off' means? 'Studys show' is another almost always disingenuous means of validating whole cloth bullshit.

About 25-30 years ago while making a few parental visits to middle school and high schools I was struck by the impression that they, unlike schools I'd attended, felt more like prisons and that teacher/administrator attitudes toward parents and especially students, were rather priggish and self-important. The places felt like police state environments; very secretive, authoritarian and punitive.

Our current world demonstrates that my instincts were spot-on. The young have developed in captivity and falsely believe their lives to be free and private.

Religions bear the same earmarks of authoritarian superiority in overseers. As supplemental training grounds for mental slaves, they do their part quite well. Religiously indoctrinated children make fine raw material for socially and politically indoctrinated adults who are, within the bounds of decorum, considered to do well.

Religion was not good for me as a child. I was always praying for forgiveness, and fearing hell.

[sciencedaily.com]

I don’t know of any, but I think child psychologists should explore this area. They unfortunately probably won’t, out of misplaced reverence.

Name one University that would fund a 20 year study unbiased with an Atheist families control group along side a fair sample of USA religious families ....since there are none the bullshit studies people are bashing you with are the PROBLEM not the answer....sexual mutilation of baby boys and rigid fear training of children is irreparable during a multi century epidemic of rapist pedophile priests & clergy.... Agnostics dot com is living proof only some children escape and heal from religionS