[Apollo]

Answer to eunuch situation: that portion of scripture is widely considered added after the fact. That would basically mean water was not in the original document.

Answer to water and spirit debacle: it happens simutaneously. Rather, as acts 2:38 puts it, you must be baptized in the name of Jesus and you SHALL recieve the gift of the holy ghost.

Sin is remitted a single time. Cleansing baptism fallowed by robe of spirit.