Final answer:
When Malcolm X joined the Nation of Islam, which might be perceived by some as a cult, he took on the name 'Malcolm X'. Martin Luther was associated with the Protestant Reformation and was never part of a cult. These two Martin figures are known for their significant religious contributions rather than cult affiliations.
Step-by-step explanation:
The query about 'Martin's name when he joined a cult' seems to be a bit confusing as it may refer to different historical figures known as Martin who were involved with religious movements, not necessarily a cult. In this context, we can discuss two prominent individuals: Malcolm X and Martin Luther.
Malcolm X
After his release from prison in 1952, Malcolm Little took on the name 'Malcolm X' as he became a minister of Islam and a prominent figure in the Nation of Islam, which some might perceive as having cult-like characteristics. His new surname, 'X', symbolized the loss of his African ancestral identity due to slavery.
Martin Luther
Martin Luther was never known to have joined a cult. Instead, he was an Augustinian monk before he initiated the Protestant Reformation in response to the corruption he perceived in the Catholic Church. His ideas and actions led to a major shift in Christian religious practices and beliefs.
The misconception of joining a cult does not align with the historical movements associated with these figures.