The 3rd Temple is not of brick and mortar. The promised Temple was Baha'u'llah and the Anti Christ was Bahau'llah's half brother who broke the Covernant.
This link is to the 'Tablet of the Temple', the Temple many wait to be built;
Bahá'í Reference Library - The Summons of the Lord of Hosts, Pages 3-54
"...Thus have We built the Temple with the hands of power and might, could ye but know it. This is the Temple promised unto you in the Book. Draw ye nigh unto it. This is that which profiteth you, could ye but comprehend it. Be fair, O peoples of the earth! Which is preferable, this, or a temple which is built of clay? Set your faces towards it. Thus have ye been commanded by God, the Help in Peril, the Self-Subsisting. Follow ye His bidding, and praise ye God, your Lord, for that which He hath bestowed upon you. He, verily, is the Truth. No God is there but He. He revealeth what He pleaseth, through His words "Be and it is"."
Happy to discuss.
Regards Tony