Yet Do I Marvel

Although Cullen believes that God had good intentions and is holy, he also acknowledges that God is the cause of evil in the world, which conveys how he is confused and uncertain about the higher power.
Cullen originally expresses the traditional Christian belief that God is both good and holy.  The first life, and ultimately the most prominent, is "I doubt not God is good, well-meaning, kind" (1).  In this line alone, Cullen expresses complete certainty regarding the subject, explicitly saying "I doubt not."  However, as the poem continues, extreme certainty about God and His intentions does not seem to be the case.
Following his seemingly certain belief in God's good intentions, Cullen then alludes to the bad things that God is responsible for, such as how it is odd and unfair that humans, though created in God's image, are not immortal and must die.  Cullen then alludes to the image of Adam and Eve, as he talks of one being "baited by the fickle fruit" (6).  However, Cullen does not express the situation being Adam and Eve's fault, he places the responsibility of not consuming the fruit on the fruit that was created by God Himself.  By using the word "baited," Cullen is removing the blame from those who ate the fruit since they were put in a trap that forced them to do so.
Cullen expresses how he aims to question God and his belief system.  This is seen in Cullen's attempt to understand God's motives and tries to comprehend "What awful brain compels His awful hand" (12).  He ends the poem by acknowledging how God was cruel to him.  God created him, a black poet, and is pushing him to share his work, which is an unfair and unusual combination.
Overall, Cullen is both impresses and displeased by God.  Although he knows and is confident in the fact that God is good and well-meaning, He can also be cruel and unfair, causing terrible events to take place, creating a contradictory belief system.