As a reminder, I point out to my friends that I do not capitalize the M in muslim, the S in sharia, or the I in islam.
It is typical to capitalize something of honor, a name (to show honor), or to capitalize the word at the beginning of a sentence. The description “religion” cannot apply to islam since its goal seeks to replace any local government with its own form, called sharia law. It is a political movement. It is designed to enslave all.
That makes islam, and anything related to it, illegal to allow into our nation, AND it makes it unworthy of having related words capitalized.