Kenya's President Uhuru Kenyatta has signed into law a controversial bill allowing men to take multiple wives without consulting existing spouses.
Christian leaders, who had called on the President to reject the legislation, said the new laws undermine the values of marriage and the family.
Archbishop Timothy Ndambuki, from the National Council of Churches of Kenya (NCCK), said: "The tone of that bill, if it becomes law, would be demeaning to women since it does not respect the principle of equality of spouses in the institution of marriage."
Last month, a number of female MPs walked out of parliament in protest after male MPs voted the legislation through, arguing that a decision to take on another wife would affect the whole family, including the financial position of other spouses.