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The Lectitio Divinitatus is the name of the book Lorgar wrote, not the religion itself.
A lectitio or lectionary, is a collection of scripture readings (technically ones that should be read on specific days).

That would make the contents of the book the Imperial Creed.
There are countless schisms of this Creed all contained within the Ecclessiarchy. When those schisms become too great, the local churches involved are either declared heretics and got rid of or forced to follow a more accepted version. This happened a lot in the early catholic church too.

Lynata wrote:

cadbren wrote:The Lectitio Divinitatus is the name of the book Lorgar wrote, not the religion itself. [...] That would make the contents of the book the Imperial Creed.

Do these novels specifically refer to it as such?

The Horus Heresy books refer to the Lectitio as a book, I don't recall if the followers are given a specific name. The contents being the Imperial Creed is my opinion.

According to the 2E SoB Codex, the Imperial Creed embodies the ideals of the founder of the Temple of the Saviour Emperor,

That may be so, but the Temple of the Saviour Emperor sounds like the name of a church. Even if that is where the Ecclessiarchy originated, it doesn't mean that is the name of the religion. It would be like calling Catholicism 'The Vatican' or similar.