Another stage of review is the lack of scientific support for the claims made by ACIM. The course asserts that their teachings can result in profound religious transformation and therapeutic, but these claims are not supported by medical research or medical studies. Without empirical evidence to straight back up their assertions, ACIM depends heavily on historical evidence and personal testimonials, which are inherently subjective and unreliable. The possible lack of demanding, objective research helps it be difficult to confirm the real effectiveness of the program and raises questions about its over all legitimacy.

The commercial aspects of ACIM also ask skepticism. Because their publication, the course has spawned a multi-million dollar business that features publications, a course in miracles eckhart tolle workshops, seminars, and on the web courses. Critics argue that the commercialization of ACIM undermines their religious concept and raises ethical considerations in regards to the motivations of those who promote it. The high fees connected with participating in ACIM-related activities may be prohibitive for many, resulting in accusations that the course is more dedicated to income than on real religious growth. This commercialization is seen as exploiting the spiritual wants and vulnerabilities of an individual for financial gain.

Moreover, the language and design of ACIM are often criticized for being very complicated and esoteric. The course's dense and similar prose could be tough to know and understand, resulting in distress and misinterpretation among readers. This difficulty can make a barrier to access, which makes it hard for people to fully engage with and take advantage of the course. Some experts disagree that the convoluted language is a purposeful approach to obscure the possible lack of substantive material and to produce an dream of profundity. The difficulty in comprehending the product also can cause a dependence on outside educators and interpreters, further perpetuating the commercialization and possibility of exploitation within the ACIM community.

Moreover, the idea of forgiveness as shown in ACIM has been criticized to be very basic and probably dismissive of true damage and injustice. The program advocates for an application of forgiveness that involves recognizing the illusory character of the observed offense and letting move of grievances. While this process can be useful in selling inner peace and reducing personal putting up with, it may not acceptably handle the complexities of certain situations, such as for example punishment or endemic injustice. Authorities fight that this type of forgiveness can be seen as reducing the experiences of victims and absolving perpetrators of accountability. This could result in an application of spiritual skipping, where individuals use spiritual concepts to avoid dealing with uncomfortable emotions and difficult realities.

The overall worldview shown by ACIM, which emphasizes the illusory character of the material earth and the vanity, may also be problematic. This perspective can lead to an application of religious escapism, where individuals disengage from the physical world and their challenges and only an idealized spiritual reality. While this might provide short-term aid or perhaps a feeling of transcendence, it can also cause a not enough diamond with important aspects of living, such as for instance relationships, responsibilities, and social issues. Experts disagree that this disengagement could be detrimental to both the patient and culture, since it advances a questionnaire of passivity and neglect of real-world problems.