Lying is a sin in islam.its right up there near the top of big sins, along with worshipping other things other than God. And also showing disrespect to parents.
You might not understand or agree, and that's absolutely fine. That's your choice. However in the bible there are many prophets who had hundreds of wives
Several prophets in the Bible had more than one wife. Abraham, Jacob, David, and Solomon are prominent examples of prophets who practiced polygamy, according to the Old Testament.
Here's a more detailed look:
Abraham: Had at least two wives, Sarah and Hagar.
Jacob: Had four wives: Leah, Rachel, Bilhah, and Zilpah.
David: Had multiple wives and concubines.
Solomon: Had 700 wives and 300 concubines.
Moses: While the Bible mentions Moses having one wife, Zipporah, some interpretations suggest he may have had another wife, possibly an Ethiopian woman according to some historical accounts.
. It's just one thing that happens in a few religions. Not just islam.
But in islam, you have to be fair and righteous. You can't hit your wife, you can't slap in the face, you can't cheat, spy or snoop, you can't deceive, you can't bribe or blackmail. You can't be unfair or steal. You can't hurt or murder people unjustly.
And in islam, if you wish to take a 2nd wife, because for example there was a widowed woman whose usband was murdered and ahe has literally no one, no money nothing and the husband and wife agree to help poor Aisha, or something like that it happens. Or for example the wife cannot bear children, so she agrees for him to take on another. It happens. Mormons do it and no one bats an eyelid.
Women also have the right to say no to a second wife. In a Marriage contract and that should be upheld. She also can request divorce and remarry. In fact prophet Muhammed encouraged men to marry women who had been divorced or widowed because they need help.and support.
Some women don't really mind. And men have to be fair and equal to all. It's not men's way or the highway. Women have the rights to money, property and their own work, and their income from their job is all theres but his money is hers too.
Op, I would suggest asking him to talaq you and manage co parenting together in this country ypure in, if you feel you don't want to rip a family apart.