fornication, page-12

As it happens every religion (that I know of) supports marriage as the foundation for the shared life of a couple
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You bet they do. Some even support polygamist multiple marriages. Oh. How things have deteriorated since Monogomy gained prevelance.

Given that polygamy was the way of the past, as detailed below, you must be upset at its decline. Maybe you would prefer Julia married several men.
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Polygamy has been practiced by mankind for thousands of years. Many of the ancient Israelites were polygamous, some having hundreds of wives. King Solomon (peace be upon him) is said to have had seven hundred wives and three hundred concubines.

David (Dawood) had ninety-nine and Jacob (Yacub, peace be upon them both) had four. Advice given by some Jewish wise men state that no man should marry more than four wives. No early society put any restrictions on the number of wives or put any conditions about how they were to be treated. Jesus was not known to have spoken against polygamy. As recently as the seventeenth century, polygamy was practiced and accepted by the Christian Church.

The Mormons (Church of Jesus Christ of Latter
Day Saints) has allowed and practiced polygamy in the United States.