Furthermore, the content of ACIM diverges somewhat from conventional Religious teachings, despite its frequent recommendations to Religious terminology and concepts. The class reinterprets essential facets of Christianity, like the character of failure, salvation, and the position of Jesus Christ. For instance, ACIM teaches that crime is not real and that salvation is achieved through a change in perception rather than through the atoning sacrifice of Jesus. This reinterpretation is visible as problematic for those who stick to orthodox Christian values, as it fundamentally alters the core tenets of the faith. The divergence from traditional doctrine has led several Religious scholars to ignore ACIM as heretical or misleading.

The emotional impact of ACIM on its adherents is still another area of concern. Whilst the program promises inner peace and religious enlightenment, some mental wellness experts have raised alerts about their possible to cause distress, disillusionment, and actually emotional harm. The course's increased exposure of the illusory character of the material earth and the vanity may cause persons to question the truth of these a course in miracles  activities and emotions in techniques might not be beneficial. For some, that wondering can result in a diminished volume to deal with real-world problems and associations, ultimately causing solitude and a feeling of detachment from life. Experts fight that such an strategy can be particularly harmful for people that are already weak or struggling with mental health issues.

Yet another level of critique is having less empirical support for the claims made by ACIM. The course asserts that its teachings can result in profound religious transformation and therapeutic, but these claims are not reinforced by clinical research or clinical studies. Without scientific evidence to right back up their assertions, ACIM depends seriously on anecdotal evidence and personal recommendations, which are inherently subjective and unreliable. The possible lack of arduous, objective research causes it to be difficult to establish the actual efficiency of the program and raises issues about its over all legitimacy.

The industrial areas of ACIM also ask skepticism. Because its distribution, the class has spawned a multi-million dollar business that includes publications, workshops, seminars, and on the web courses. Critics argue that the commercialization of ACIM undermines its spiritual information and increases honest considerations concerning the motivations of those who promote it. The large charges connected with participating in ACIM-related activities could be prohibitive for most, leading to accusations that the program is more centered on profit than on authentic religious growth. This commercialization is seen as exploiting the spiritual wants and vulnerabilities of individuals for financial gain.