I think it would be better if you allow the users to write some specific tags by capital letters. I mean let them write the initial letter of the words with capital letters. For instance, for specific words such as: Hadith, Haram, Sunni, Shia, Tafseer and so forth.
Besides I assume that it could help the readers who are not professional (or are not familiar with Islamic expressions) to know that those words mainly are not English words, (in truth they’re related to Fiqh (jurisprudence), such as Tafseer, Fiqh, Fatwa and so forth.
On the whole, it would be better if you let the users write some specific tags with capital letters. (their start letters).