I think the Opus Dei folks might be a little nuts... but what a patronizing article about Christians, as if being one somehow would mean that you just naturally would stay away from anything rational.
In 1939, Escriva published a book to guide these converts called The Way. It remains an intriguing read. Arranged in 999 short fragments, each a saying or instruction, its tone is by turns intimate, fierce and stiffly formal. [snip]How to behave towards Opus Dei is another: "941 - Obedience [is] ... the sure way. Blind obedience to your superior ... the only way." "627 - Yours should be a silent obedience."
When somebody demands blind obedience, wariness is best.
And do you think that the people of Jesus' time thought that He was a little nuts, too.
Your argument doesn't hold water.
And the beatitudes that were read in the Gospel today, tell us to be counter-culture. Be poor instead of rich, hurting instead of on top of the world, helpful rather than firing employees as a ruthless boss. A little nuts -- no?