Is there a single word for 'blind worship' as in worshiping an actor blindly notwithstanding the bad performance?
If you're looking for noun
A person filled with excessive and single-minded zeal, esp. for an extreme religious or political cause.
A person who is fanatical and uncompromising in pursuit of their religious, political, or other ideals.
If you're looking for adjectives
Having or proceeding from a fanatical belief in something
Filled with excessive and single-minded zeal.
When you love someone excessively and blindly you idolise them. This form of love and admiration is called idolisation.
You could perform a parasynthesis of the word using the prefix mis-.
To worship wrongly
wordnetweb: 'a foolish and usually extravagant passion or love or admiration.'