From the mental standpoint, the sources of ACIM raise issues about its validity. Helen Schucman, the primary scribe of the writing, claimed that the language were formed to her by an interior voice she determined as Jesus. This method of receiving the writing through inner dictation, known as channeling, is usually met with skepticism. Authorities fight that channeling can be recognized as a mental sensation rather than true spiritual revelation. Schucman himself was a clinical psychologist, and some declare that the voice she heard may have been a manifestation of her unconscious mind as opposed to an additional divine entity. Additionally, Schucman indicated ambivalence about the work a course in miracles and their sources, often questioning their authenticity herself. That ambivalence, coupled with the method of the text's reception, portrays uncertainty on the legitimacy of ACIM as a divinely influenced scripture.

The information of ACIM also encourages scrutiny from the philosophical angle. The program shows that the world we see with our feelings is an dream and that our correct truth lies beyond that physical realm. That idealistic view, which echoes certain Eastern ideas, challenges the materialistic and empirical foundations of European thought. Experts fight that the declare that the bodily earth can be an illusion is not substantiated by scientific evidence and runs table to the medical method, which relies on observable and measurable phenomena. The thought of an illusory world may be compelling as a metaphor for the disturbances of perception due to the ego, but as a literal assertion, it lacks the empirical support needed to be considered a legitimate representation of reality.

Moreover, the practical request of ACIM's teachings could be problematic. The course advocates for a revolutionary kind of forgiveness, indicating that grievances are illusions and should be neglected and only realizing the inherent unity of all beings. Whilst the practice of forgiveness can indeed be therapeutic and major, ACIM's method might lead individuals to curb genuine emotions and ignore real injustices. By surrounding all negative experiences as illusions developed by the confidence, there's a danger of minimizing or invalidating the existed experiences of putting up with and trauma. This perception could be especially harmful for people dealing with critical problems such as for instance abuse or oppression, as it might suppress them from seeking the required help and interventions.

Still another stage of rivalry is the way in which ACIM has been marketed and commercialized. Since its publication, ACIM has spawned a substantial business of workshops, seminars, and supplementary materials. Authorities disagree that this commercialization undermines the religious integrity of the teachings, turning what is purported to be a sacred text right into a profit-driven enterprise. The expansion of ACIM-related products and services and solutions has led some to question the motivations behind their campaign and the credibility of those that maintain to teach its principles. That commercial part can cause a barrier to authentic spiritual exploration, as people might become more dedicated to getting another guide or joining another course as opposed to engaging deeply with the teachings themselves.