Biology 101
You don't have to have any religious convictions to recognize that life begins at conception. Any biology textbook even Wikipedia will tell you that fertilization is the moment at which a new individual is formed a unique individual, genetically distinct from either parent. In the case of human parents, that new individual is also a living, growing human being. No matter what words we use to describe the stages of human development zygote, embryo, fetus, baby, child all refer to a human being not yet fully grown.
Thus, for the intellectually honest, abortion can only rightly be understood as the willful killing of an innocent child.
Can we, as a nation, develop the mercy and compassion to value and protect the lives of these children?
A person is a person no matter how small.
Article: Scientific Fact: Human Life Begins at Conception, or Fertilization
Argument from Consciousness