If you are talking simply of Shintoism, there have never been any holy writings.
Shintoism is indigenous to Japan as a spiritual practice of their people. As such, they would not normally read the Judeo-Christian Bible. However, this does not mean someone who practices Shintoism could not or has not read the Bible.
There is no founder for Shintoism
Shintoism, Shinto
There is know founder for shintoism.
Shintoism is the major religion in Japan.
The Halawali is the key text of Shintoism.
Shintoism is a spiritual practice in Japan
Jomon
Shintoism does not have one main god. It has over 8 million different kamis (spiritual beings that exist in animals, plants, nature, etc). A large majority of Japanese people worship Amaterasu as the "main" kami of Shintoism. Amaterasu is the goddess of the sun.
Shintoism people worship at shrines I think
There is no conflict any more than the Betty Crocker Cookbook is at odds with the the instruction manual for your DVD player.
The Romans did not have any contacts with Shintoism