And how where those sacred writings of Christians assembled into one book?
Papyrus, leather, bark, wood, plants, straw, other natural products.
Well, let's see. God used men to collect the letters of a select few Apostles and the Hebrew's tanakh to be compiled into what is now known as the Christian bible. Much the same way He used Pharaoh to free His people, God used the powers of the day (at the time it was the reformed babylonian religion renamed the Catholic Church, or Roman Church) to collect and compile the first bible. Later God used a confused English king to order the translation of all those letters and scrolls into the English language however... just because God used pharaoh, the catholic cult, king James or any other medium to accomplish His will does not make any of those mediums special. Hell... He even spoke through the mouth of a jackass, wrote on a wall and revealed Himself in a host of other ways. This does not make any of these special, ironically... the catholic cult has puffed itself up for centuries and deceived billions of people over the millennia thinking they are something special.
They're not.
I know that catholics have a hard time with this but God is in control. Being used by God does not give one a leg up in God's eyes or make someone any more special than another. Even the Apostles are warned that before they can become a pillar in God's temple they must first mortify the deeds of the old man and overcome the world. We must make our enemies our footstool.
NO ONE can reach God through the catholic teachings, by paying penance, belonging to the catholic "Church", blowing themselves up, drinking koolaide and riding a comet to paradise or licking any other toads.
There is only ONE WAY to God and that is through Jesus Christ.