Empirically, there is little to no medical evidence encouraging the metaphysical states produced by ACIM. The indisputable fact that the bodily world can be an impression created by our collective confidence lacks empirical help and works counter to the substantial human anatomy of clinical knowledge gathered through generations of remark and experimentation. While subjective activities of transcendence and religious awakening are well-documented, they cannot offer target proof the non-dualistic fact that ACIM describes. Furthermore, the course's assertion that adjusting one's feelings may alter fact in a literal feeling is reminiscent of the New Believed action and the more recent law of interest, both of which have been criticized for missing clinical validity. The placebo influence and the ability of positive considering are well-documented phenomena, but they do not help the grand metaphysical claims created by ACIM.

More over, the sources of ACIM raise extra questions about its credibility. Helen Schucman, the psychologist who transcribed the class, explained her experience as obtaining dictation from an inner voice she identified as Jesus. This acim of channeled writing is not unique to ACIM and are available in several other spiritual and spiritual texts through the duration of history. The subjective nature of those activities makes it difficult to examine their authenticity. Critics disagree that such texts are more likely services and products of the subconscious brain as opposed to communications from a heavenly source. Schucman herself had a complex relationship with the substance, supposedly encountering substantial internal conflict about their content and their beginnings, which gives still another coating of ambiguity to the course's claims of heavenly authorship.

Furthermore, the language and style of ACIM in many cases are esoteric and abstract, rendering it burdensome for many readers to understand and apply their teachings. The program is prepared in a very stylized type of English, with heavy, graceful prose which can be difficult to interpret. This complexity may lead to a wide selection of interpretations, some of that might diverge considerably from the intended message. The ambiguity of the writing enables subjective parts, which can result in misunderstandings and misapplications of its principles. This insufficient quality may undermine the course's performance as a functional information for religious development and self-improvement.

Furthermore, the commercial part of ACIM can not be overlooked. Because its publication, ACIM has spawned a profitable market of publications, workshops, seminars, and study groups. While financial success doesn't inherently negate the worthiness of a spiritual training, it will raise concerns concerning the possibility of exploitation. The commercialization of spiritual teachings can sometimes lead to the prioritization of revenue over authentic spiritual progress, with individuals and organizations capitalizing on the course's acceptance to promote products and services. This vibrant can deter from the sincerity and strength of the teachings, spreading uncertainty on the motives behind their dissemination.