Very interesting, thank you for posting this. He suffered not only from the sickness that caused his death, but from rejection by his circle of friends. But he had courage and suffered to the final triumph.
His conversion is disputed because he did not confide in his wife or daughter Holly, who later edited his poems and letters.
I just googled it and found the letter from Father Hanley, who baptized Stevens in the hospital. I see no reason to doubt what he says. Naturally most modernist literary critics prefer to put the whole business down the memory hole.
http://www.writing.upenn.edu/~afilreis/Stevens/conversion.html