Dare I ask if this constitutes heresy?
Suppose it depends on what they think “bless” means. If it’s #1 I’d say yes.
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bless·ed (blsd) also blest (blst)
adj.
1.
a. Worthy of worship; holy.
b. Held in veneration; revered.
2. Blessed Roman Catholic Church Used as a title before the name of one who has been beatified.
3. Bringing happiness, pleasure, or contentment.
4. blessed Used as an intensive: I don’t have a blessed dime.
Heresy is a possibility. The so-called pastors who were going to burn the Quran were engaging in blasphemy, since the definition is carrying God’s name in a false or bad way. God never commanded, nor did Jesus instruct to do any of these things. Sometimes people forget themselves.