That's a bunch of baloney.
And you're saying that based on what? Your extensive knowledge of what goes on at hiring committee meetings of Fortune 500 companies and top-tier banks and law/accounting firms? Because that's where my information is coming from. Here are some of the reasons that I've heard of why some companies no longer want to hire frum people:
1) They show up to client meetings looking like a caveman because they say that they aren't allowed to shave during the 3 weeks or sefira (not realizing that there are a fair amount of other employees that are frum and are shaving during those time periods, therefore making it clear to partners that they are full of it).
2) Frum employees still leaving early on Friday during the summer months because they choose to make early Shabbos or decide that they need to go to the Catskills for Shabbos.
3) Using the "you can't bother me about working less hours than my co-workers because I have Shabbos which makes me leave early on Friday/not respond to emails on Shabbos, and if you do it's discrimination" excuse, when what they should be doing is putting in extra hours on Saturday night or Sunday to make up for it.
Should I keep going, or do these scenarios sound strikingly familiar to you?