Moses wrote down All the words God said including the 10commandments in the book. It still Gods Words whether was inside the Ark or outside.
Believe what you want- scripture tells us something different, you are not hurting me, if you do not want to give glory to God for what He took credit for and give it to Moses instead, you can work that out with Him one day soon. Not sure how one will make the case I beleive in Jesus but not His Words, what He taught or how He lived. It sounds like a lot of people what the promises and blessing of Jesus, but do they really want Jesus?
He personally wrote it on stone for its eternal nature:
Exo 31:18 And when He had made an end of speaking with him on Mount Sinai, He gave Moses two tablets of the Testimony, tablets of stone, written with the
finger of God.
He personally spoke it
Exo 20:1 And
God spoke all these words, saying:
He numbered them by design - the only law numbered in scripture
Deut 4:13 So
He declared to you
His covenant which He commanded you to perform,
the Ten Commandments; and
He (God) wrote them on two tablets of stone.
Note whose Covenant is this- Moses or God?
Right in the Ten Commandments God claimed them as His commandments
Exo 20:6 but showing mercy to thousands, to those who love Me and keep
My commandments.
After the Ten Commandments- no more was added, it is a standalone unit
Deut 5:22 “These words the Lord spoke to all your assembly, in the mountain from the midst of the fire, the cloud, and the thick darkness, with a loud voice; and
He added no more. And He wrote them on two tablets of stone and gave them to me.
Only the Ten Commandments was placed inside the ark of the covenant
Exo 25:16 And you shall put
into the ark the Testimony which I will give you.
The Ten Commandments is the work of God- not Moses and when people choose not to give credit to God for His work is doing a disservice to God. There is not more God could have possibly done - He came down from heaven to write His holy and eternal law that He claimed as His. And its so sad people deny Him of this. As if there is someone greater.
Exo 32:16 Now the tablets
were the work of God, and the writing
was the writing of God engraved on the tablets.