Sacrifice Once (36:0)
Bases for Christian belief: "We have been sanctified through the offering of the body of Jesus Christ once (for all)" (hebrews 10:10) "But this man, after he had offered one sacrifice for sins forever, sat down at the right hand of God" (heb 10:12) (36:1) see
In Hebrews it says "So Christ having offered once to bear the sins of many, will appear a second time.." (heb 9:28), and Bahá'u'lláh is the Return of the Same Christ Whose sacrifice was so perfect and long-lasting. (36:2) see
"For by one offering he hath perfected for ever them that are sanctified. (heb 10:14) (36:3)
The argument is that Christ's sacrifice once and for all is enough to sanctify all people therefore, Bahá'u'lláh is not needed.