One of the main opinions of ACIM is its source history and the states made by its proposed writer, Helen Schucman. Schucman, a clinical psychiatrist, stated that this content of the class was dictated to her by an interior voice she identified as Jesus Christ. That story alone improves issues concerning the reliability of the writing, because it relies heavily on a subjective and unverifiable experience. Critics fight that the entire base of ACIM is based on an individual discovery that can not be substantiated by scientific evidence or external validation. That insufficient verifiability makes it hard to just accept the program as a legitimate religious or emotional guide.

More over, the information of ACIM diverges somewhat from traditional Christian teachings, despite its regular recommendations to a course in miracles Christian terminology and concepts. The course reinterprets crucial facets of Christianity, such as the nature of sin, salvation, and the position of Jesus Christ. For example, ACIM teaches that sin is not actual and that salvation is achieved via a modify in understanding as opposed to through the atoning lose of Jesus. That reinterpretation is seen as problematic for individuals who adhere to orthodox Religious beliefs, because it fundamentally alters the key tenets of their faith. The divergence from old-fashioned doctrine has led many Religious scholars to dismiss ACIM as heretical or misleading.

The mental impact of ACIM on their adherents is another section of concern. As the program promises internal peace and spiritual enlightenment, some emotional health specialists have raised alerts about their potential to trigger frustration, disillusionment, and also psychological harm. The course's increased exposure of the illusory nature of the product world and the ego can lead people to issue the truth of their experiences and feelings in ways that might not be beneficial. For a few, that pondering can result in a decreased capacity to cope with real-world problems and associations, leading to isolation and a feeling of detachment from life. Authorities fight that this kind of approach can be specially dangerous for persons that are currently vulnerable or struggling with mental wellness issues.

Yet another point of review is having less empirical help for the states created by ACIM. The course asserts that its teachings can result in profound spiritual change and healing, but these claims aren't reinforced by scientific study or medical studies. Without scientific evidence to right back up their assertions, ACIM relies heavily on anecdotal evidence and personal testimonials, which are inherently subjective and unreliable. Having less demanding, target study makes it hard to determine the real efficiency of the course and improves questions about their overall legitimacy.