Because of the destruction of the wicked at the Savior’s Second Coming, only righteous people will live on the earth at the beginning of the Millennium. They will be those who have lived virtuous and honest lives.
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People will still have their agency, and for a time many will be free to continue with their religions and ideas. Eventually everyone will confess that Jesus Christ is the Savior.
Besides which, how could other religions exist in the Kingdom of God? If you read scripture, it’s clear that only Christians can be alive during this time:
Revelaton 20:4-5
4And I saw thrones, and they sat upon them, and judgment was given unto them: and I saw the souls of them that were beheaded for the witness of Jesus, and for the word of God, and which had not worshipped the beast, neither his image, neither had received his mark upon their foreheads, or in their hands; and they lived and reigned with Christ a thousand years.
5But the rest of the dead lived not again until the thousand years were finished. This is the first resurrection.
Also, how could people “continue to have children as we do now”? That’s in direct contradiction with this:
Matthew 22:30
“For in the resurrection they neither marry, nor are given in marriage, but are as the angels of God in heaven.”
Are the mormons teaching that extramarital sex will be condoned in the Kingdom?
There is very little in the way of logic attached to mormonism. That’s one reason I left it.