Selena Gomez -- Ankle Porn in Abu Dhabi Pisses Off Mosque Leaders

Selena deleted the photo Thursday afternoon.

Selena Gomez stripped down and showed way too much skin on her ankles while visiting a mosque in Abu Dhabi -- and now she's getting blasted for her "disrespectful" poses.

Gomez and co. -- Kendall Jenner, Gigi Hadid, Cody Simpson, and Shay Mitchell -- posted a few photos this week taken inside the Sheikh Zayed Grand Mosque ... which is now getting flooded with complaints.

Folks at the mosque tell us the main issues their members have with the pics are:

1) Selena's exposed leg, and her sexy pose ... both are no-nos. It's a respect thing.
2) Mosque rules prohibit laughing and smiling ... again, it's about respect.

Selena did one-up Rihanna, in a sense. RiRi visited the same mosque last year, but when she posted pics ... she was immediately asked to leave. Mosque leaders went easier on Selena.

Maybe they're just not that into her.