One way to approach the topic might be to watch "The Gift" on Netflix and realize that the book was written by a woman who practices (quite successfully, too) these Shamanic ideas. Then, the context would be that these sorts of stories and myths are extremely popular in Turkey (which is why the book was a hit) and that they live - in an uneasy, unspoken relationship - side by side with Islamic teachings that are culturally from a very different origin. Another option is to look at Sufism and its capricious relationship with official, state sponsored Islam. Many Turks I know like to view themselves as heavily inspired by Sufism.
Not sure if I am qualified to explicate on traditions in detail, but my feeling is your intuition holds quite true, at least in Turkey. Many little things, from reading coffee, to marriage rituals, to protection against "evil eyes" and spirits, personification of devils and angels, things that are bad luck and generally most "Islamic" things that you find are unique to Turkey compared to Arab countries - are probably things that predate Islam.
I’m not sure that this is an Islamic trait so much as a victor/oppressor behaviour.
You see this in buildings throughout history, where the dominant power converts existing structures to their usage, or destroys things they don’t want. It’s how rulers seek to dominate.
Something I've wondered about art and traditions that predate Islam, is how many of those spiritual and material traditions were appropriated or assimilated into Islam and have survived for centuries by becoming mainstream. e.g. Christmas - the tree, the 3 days of the solstice relating to the resurrection, it was a long time before it became common knowledge that those "Christian" traditions pre-date Christ, right? So what ancient history is staring us in the face because we've been calling it Islamic all this time?