It isn't a lie and no it doesn't reduce the value of human life.
Evolution can be true and the image of God is also true. But any philosophy can devalue human life, including forms of Christianity.
My biggest problem with the pro life movement is the hypocrisy in their concept of "pro-life".
Protect the unborn, but not innocent children from firearms. Prohibit abortion but not the death penalty when we know it is most often used against the poor and kills the innocent. Demand all pregnant women give birth but campaign against any government program that supports poor people. Become angry at poor women who have multiple children, but oppose government paid contraception and sex ed classes. Insist the church must care for everyone, even if it doesn't have the resources to do so.
The "pro life" movement as it is today does not take its principle from Christ or old testament ideas of social justice.
It is how God created. It is no lie, it is part of God's glory that every organism on earth can change in response to the environment and create endless beautiful forms.