I was pleasantly surprised that the temple had many devotees.

I am pleasantly surprised .... Has

I was surprised . . . Had

I was pleasantly surprised that the temple has/had many devotees.

(But the fact is that there are at present many devotees. So I wonder has is possible. And at the time of the speaker speaking, it is till true.)

has can be used for the at present scenario...

Thanks, Region. So, if a sentence contains a general truth, a present tense verb can be used, just as it is for a universal truth. For example. "The teacher said that the world is round." (Here the fact that the world is round is a universal truth.)

yes...

Thanks again, Region.

You're clearly not a native speaker, and your knowledge of English is shaky to say the least. You need to butt out of threads like this, you don't know what you're talking about and serve only to confuse people asking questions.