Quite simply, if you believe in human rights, then you must believe that human rights belong to all humans. And for human rights to have any meaning at all, those rights should begin when the human begins: at fertilization.
The law in Canada (and in certain American states) offers absolutely no protections for the pre-born child. From conception to birth (and sometimes even immediately after birth), a pre-born child can be killed for any reason or for no reason at all. This is a gross violation of human rights. Because Christians recognize pre-born children as our neighbors, made in the image of God, we must be at the forefront of defending their lives. God calls us to nothing less. As Bonhoeffer once said, “Silence in the face of evil is itself evil. God will not hold us guiltless. Not to speak is to speak. Not to act is to act.”