Empirically, there is little to number medical evidence promoting the metaphysical states created by ACIM. The idea that the bodily world is definitely an impression created by our collective ego lacks scientific support and operates counter to the great body of clinical knowledge accumulated through centuries of remark and experimentation. While subjective experiences of transcendence and religious awakening are well-documented, they do not provide purpose evidence of the non-dualistic reality that ACIM describes. More over, the course's assertion that adjusting one's feelings may change reality in a literal feeling is similar to the New Believed movement and the more recent legislation of attraction, both of which were criticized for missing medical validity. The placebo influence and the ability of positive thinking are well-documented phenomena, but they don't support the grand metaphysical claims made by ACIM.

Furthermore, the roots of ACIM raise additional issues about their credibility. Helen Schucman, the psychiatrist who transcribed the course, defined her experience as getting dictation from an internal style she determined as Jesus. This method of channeled writing is not unique to ACIM and is found in many other spiritual acim and religious texts all through history. The subjective character of those activities causes it to be difficult to validate their authenticity. Experts argue that such texts are more likely services and products of the subconscious brain rather than communications from the heavenly source. Schucman herself had a sophisticated relationship with the material, reportedly experiencing significant internal conflict about their content and its origins, which gives yet another coating of ambiguity to the course's states of heavenly authorship.

In addition, the language and style of ACIM in many cases are esoteric and abstract, rendering it burdensome for many viewers to understand and use their teachings. The class is prepared in a very stylized kind of British, with thick, lyrical prose which can be demanding to interpret. That complexity can cause a wide variety of understandings, a few of that might diverge considerably from the intended message. The ambiguity of the writing permits subjective numbers, which can lead to misunderstandings and misapplications of their principles. This not enough clarity may undermine the course's performance as a practical manual for religious growth and self-improvement.

More over, the professional part of ACIM cannot be overlooked. Since their publication, ACIM has spawned a profitable industry of books, workshops, seminars, and examine groups. While financial achievement doesn't inherently eliminate the value of a religious training, it will raise considerations about the prospect of exploitation. The commercialization of religious teachings can occasionally cause the prioritization of gain over real spiritual growth, with people and organizations capitalizing on the course's popularity to promote services and products and services. This active may deter from the sincerity and integrity of the teachings, casting doubt on the motives behind their dissemination.