What mistake results from omitting idhā mātū wa-hum muwaḥḥidūn in the major-sins statement?

Reading the Creed Text: Terms, Qualifications and Meaning

• Immediate pardon of all sins would be directly established
• A qualified statement would be misread as unconditional
• The text would become a statement about prayer time
• The word tawḥīd would become merely ornamental