Earlier quoted context omitted.
> Saudi Arabia is a very thorough implementation of Islam, and therefore a disgusting country. You make the assumption that the Saudi version of Islam is the only valid one. It's not.
I don't think the parent made that assumption, though. They stated it was "thorough", not valid. While I have no idea what a "valid" interpretation of Islam means (it seems like an unprovable honorific, bestowed arbitrarily), "thorough" seems more like an assertion of direct correspondence to the original text.
Direct correspondence to the original text is not the way most religions work, and it's not the way Christianity and Islam have worked historically.
Scripture is not always interpreted literally, and the people who insist on a literal interpretation are usually innovators, because it wasn't done that way originally.
The literalists are not more thorough than the others in their understanding of their religion or their dedication to it -- they are just more literal in their reading, and often more simplistic in their beliefs as a result.