I know far more about Metis beliefs than I know about Creole culture, but in general I can tell you that there are an almost complete continuum of Metis beliefs across different communities. Even in the most Catholic communities I've visited and worked in the beliefs are still quite syncretic. Just to mention a few points -

• Many Metis pilgrimage destinations overlap places of earlier religious significance, for example Lac St. Anne (though I only have this from some Metis elders, not from any good published sources).
• Metis holiday such as ochimewikishikaw or kissing day for new years - these aren't Catholic traditions, nor are the approaches to giving massive gifts like teams of horses or vehicles that used to be fairly common.
• Metis traditional medicine is definitely a blend of catholic type prayers and Cree knowledge and practices.
• Metis stories are incredibly syncretic, with a mixture of European and Saulteaux/Cree/Assiniboine narratives, characters and tropes. this includes stories about Christian characters, such as my favourite about Li Pchi Beebi Jeezu visiting a woman who hides her children in a box and says they are bear cubs, so the little baby jesus leaves her and turns her children into bears.

Some other observations -

• most Cree speaking Metis Communities (as opposed to Michif or French) tend to be far more likely to be involved in Midewin, and to be protestant! Though there are no absolutes. I have no idea what the actual ratio of protestants to Catholics is, but historically both communities were given (I think) equal representation in the Red River legislature prior to the first Resistance.

I don't think your question entirely misses the mark, as I do think there is perhaps less syncretism today than there is in the Creole community - but even then I don't know if I am thinking of the Creole community as it is, or simply as it is portrayed in popular culture, film and literature.