What is one reason why some may argue that Constantine was not a true Christian?

The argument that Constantine was not a true Christian often hinges on the fact that he was baptized by an Arian bishop. Arianism was a significant theological contention in early Christianity that disputed the nature of Christ's divinity, which was deemed heretical by many orthodox Christians. The association with an Arian bishop can cast doubt on Constantine's orthodox Christian beliefs, as it raises questions about his allegiance to the doctrines that later became foundational to Christianity as understood by the Church.

Moreover, his baptism by such a bishop might be seen as indicative of his complex relationship with Christianity. While he played a crucial role in promoting the faith and convening the First Council of Nicaea to address Arianism, his own acceptance of the Arian doctrine through his bishop arguably complicates his identity as a "true" Christian in the eyes of those who follow more orthodox beliefs.

The other reasons mentioned don't effectively capture the nuances of Constantine's beliefs and the historical context. For instance, his hesitation to be baptized until he was near death (as captured in some historical accounts) points to a different aspect of his faith journey, while his dedication of a temple to pagan gods reflects the political and cultural realities of his time rather than a personal belief system. Similarly,