This is dealt in more depth in my two research papers “What Distinguishes a Small Religion and Large Cult?”and “Korean Shamanism: Religious Syncretism in Early Korean Dynasties”.
 

The first research paper “What Distinguishes a Small Religion and Large Cult” investigates the relationship between Christian science and Vodou religion.

While Vodou and Christianity both aim to heal people with religion, Vodou religion was framed as a “black magic cult” to mainstream America, characterizing its relationship to spirits and mysticism as dangerously “Other.” 

In contrast, the rise of Christian Science in the late 1800s was ideologically supported by the Christian Church.