I had it cut a while ago.  (If you don't want to specify when). or I didn't just have it cut.

The expression is usually "a spring cleaning." not spring-clean. The first sentence is ok, The second sentence would be ok if you wrote it this way. Sounds like you're having kind of a spring cleaning on Facebook (take off the 's' and the word' like')...or could be Sounds like you are having something like a spring cleaning of Facebook. (or on).

Both suggestions next to your arrows are correct and natural.

rich = affluent cut = sever can be interchangeable but sever means more than cut. Sever is usually applied when speaking of separating something into two or taking off a piece. The man severed his finger. He severed off a piece of meat to taste. To sever is to cut but to cut is not always to sever. revere means to feel deep respect or admiration for (something). An example of revere: "She revered her grandmother for all she accomplished in her life." Dignify is to make (something) seem worthy and impressive. "the Americans had dignified their departure with a ceremony" synonyms: ennoble, enhance, distinguish, add distinction to, honor, grace, exalt, magnify, glorify, elevate "shall we dignify their arrival with some music?" give an impressive name to (someone or something that one considers worthless). "dumps are increasingly dignified as landfills" Revere and Dignify are not synonymous

The author is saying that Jesus is another figure like the Buddha who has some quotes attributed to him, but which we cannot be sure that they are indeed from him. (They cannot be pinned down, in other words verified for sure.)

Both are actually correct, but there is a typo the second example. You can indeed say "How many of those people do you actually often see ? " or How many of those people do you actually see frequently?"