The Yule Yikes

Yule is one of Kestrel's favorite times of year. The lights, the decorations, the food, the family time, all bring her joy.
But this year, someone is trying to take away Kestrel's joy. She finds cruel notes on her porch and in her yard saying that Kestrel's family is evil for having a pentacle in their front window.
Who is leaving the notes? Why do they think Kestrel's family's beliefs are evil? And most importantly, how does the note-leaver know the decoration in the front window is a pentacle and not just a star? Kestrel is determined to find out.