I think the answer to this question is both a yes and a no, dependent upon individual circumstances. If a child is being told what to believe and will "burn in hell" if they don't believe what they're being told then this is indeed abuse. This is a form of psychological manipulation; although not intentional abuse I will grant, still abuse, nonetheless. Another example would be where a Jehovah's Witness refusing to give their child the medical care it needs because they believe this all part of God's plan; this is a form of physical abuse for sure. The latter example presented here is a very severe type of abuse; that a parent would let their child die from disease because of some "strong held belief" about God's plan with no other bases except just "pure blind faith!"
Now, faith need not generally be a bad thing. In fact, like hope, it can serve as a reliable heuristic in some cases, such as believing in yourself to win a race in a sporting event. However, when faith is being used in place of reason, logic, and critical evaluation then that's the problem and a very dire one indeed!
Moreover, religion in itself, of course, is not abuse. It is, however, the indoctrination imposed upon young minds that is abuse. Albeit, this doesn't just apply to religion; there are other belief systems that also get infringed upon young people's minds. I believe that children should be allowed to grow up to form their own decisions about what to believe and what not believe. If they decide that they want to be an Atheist then so be it; if they want to follow a particular religion then so be it, and the parents should welcome this whether they are an Atheist or a Theist.
Religion is and should be a choice. However, it is often imposed upon children rather than having them learned about it first, and then make up their own minds. As I also mentioned some people will even go so far as put the "fear of God" into some young minds that if they don't believe and behave in a such a way they will suffer in hell for eternity. Furthermore, I also said that this kind of indoctrination also applies to other types of indoctrination but I will be so bold and contend that a lot of religious adults are the worst for doing it.
Furthermore, I think also needs mentioning that Atheist too should by the same token be careful not to infringe their views upon young minds and dictate to them what not to believe. With that being said, however, I do think (generally speaking) an Atheist parent would be far more tolerable of a child that decided to follow a religion than a strong practising Christian, Muslim, or Jew would be of their child becoming an Atheist.
Another thing I have recently stumbled across lately of which I was ignorant about is FGM (female genital mutilation). https://www.cps.gov.uk/legal-guidance/female-genital-mutilation-prosecution-guidance
. Make no mistake, this is abuse and a criminal offence in the UK among many other first world countries. Also, I am pleased to say that according to UK legislation this being done because of religious ideology is no acceptable excuse whatsoever.
So, taking a number of things into account I think we can safely conclude that in some cases' religion is a form of abuse and other cases it isn't.