"Easiest and quickest way to test someone's IQ"

"What do we think of this?"
https://nitter.unixfox.eu/jollyheretic/status/1620890190792519680

"The easiest and quickest way to test if someone is taller than you..."

...is to just look. You don't need sophisticated techniques. You already know. Several reliable tests come factory-standard. They're applied whether you want them to be or not.

So, it's Satanism. They're pretending a religious test is not a religious test; it's a test that only works as intended if it's misunderstood. Here "intelligence" and "IQ" refers to adherence to dogma. It is true that "rationalizing and explaining yourself" has sharply limited utility when speaking to a religious fanatic. Or as a religious fanatic, for that matter. 

Instead you can ask yourself, without a rote recitation of ritual, whether talking to this person on your topics of interest is likely to be profitable or not. Do the accounting, and hinge the accounting on the relevant decision - stop or go? Continue or relent? I think you'll find you come to the right answer at a frequency that is more than sufficient.