The whole issue of polygamy in the bible is an interesting one and makes sense in an historic context.
Polygamy in Christianity - Wikipedia
In Islam Muhammad had many wives as was the customs of the pagan tribes. However He limited the number to four.
Baha'u'llah had three wives as was the custom of Persian nobility at that stage and said that a man could have more than one wife if He would treat them with equal justice. His eldest son Abdu'l-Baha who became the leader of the Faith and authorised interpreter stated it was impossible to treat two wives with equal justice and the standard should be monogamy which he upheld.
There is nothing in the sacred writings of Judaism, Christianity, Islam or the Baha'i writings that says sex is bad.
Shoghi Effendi, the guardian of the Faith has stated;
The Bahá’í Faith recognizes the value of the sex impulse, but condemns its illegitimate and improper expression such as free love, companionate marriage and others, all of which it considers positively harmful to man and to the society in which he lives. The proper use of the sex instinct is the natural right of every individual, and it is precisely for this very purpose that the institution of marriage has been established. The Bahá’ís do not believe in the suppression of the sex impulse but in its regulation and control.
1/ Baha'u'llah like Christ showed innate knowledge and outstanding character in His childhood. There is nothing I'm aware of that would suggest otherwise.
The Life of Bahá’u’lláh | What Bahá’ís Believe
2/ While I agree with what you say, living the life is also essential (James 2:14-26).
3/ I never said it did.
Baha'u'llah literally translated means Glory of God. The phrase the 'Glory of the Lord' which refers to Baha'u'llah is mentioned four times in Isaiah:
It shall blossom abundantly, and rejoice even with joy and singing: the glory of Lebanon shall be given unto it, the excellency of Carmel and Sharon, they shall see the glory of the Lord, and the excellency of our God.
Isaiah 35:2
And the glory of the Lord shall be revealed, and all flesh shall see it together: for the mouth of the Lord hath spoken it.
Isaiah 40:5
Then shall thy light break forth as the morning, and thine health shall spring forth speedily: and thy righteousness shall go before thee; the glory of the Lord shall be thy reward.
Isaiah 58:8
Arise, shine; for thy light is come, and the glory of the Lord is risen upon thee.
Isaiah 60:1
4/
Do you practice polyamory?