That could be said all religious texts.
As I understand it, most of the Old Testament bible, or the Hebrew Scripture Tanakh were recalling the history of their people, with some prophecies, some laws and some poems or parables. Each work were originally composed in different time. They have real people recording them.
The same could be said of the New Testament part of the bible. Some of it is a historical narratives, some prophecies, and interpretations of Jesus' teachings through mostly Paul's letters.
It is not like the Qur'an or the Book of Mormon, where the prophets said that they got the whole things through angels' visitations, which is totally unsubstantiated and unsupported that such visitations took place.
The gold plates that conveniently disappeared after Mr Smith had translated it, is not a reliable.
Nor is Muhammad's claim that Gabriel had visited him a number of times.
During the Old Testament time, people knew of who the prophets were, because no one dare to claim to be one. The book of Jonah show a very unreluctant prophet, is more believable than the one that claim that "I am the last prophet" and this is a new and "only true" religion "I am starting". Both Muhammad and Joseph Smith have such proclaimations, and make the claims fairly dubious.
In Christianity, many broke away from Roman Catholic Church, because at the time, those living in Rome were living in luxury and corruption. They own more land than any ruler, and they interfere in worldly affair, such as politics. Martin Luther didn't start a new sect because he wanted more power, but because he was trying to get back to basic.
To say that the whole bible is the work of Satan is not justifable. I don't believe in many areas of the bible, mainly with Creation and miracles, but I can accept some of its laws, and its teaching of moral and compassion, because they are universal and can be found in many other religions, as well as in non-montheistic philosophies.
Every religion have some values that are universal and can be acceptable even if you don't believe in God or gods.