1) We're talking about the actual state of affairs of whether a fetus is a child, not what people think about it. The average person has many views on many things, a lot of which are contradictory. If we follow your argument to its logical end, then slavery was alright 200+ years ago because no one had a problem with it except those dang Negros and Quaker abolitionists but magically it isn't now.Also, I literally made no references to God explicitly to give a more universal and logical viewpoint about how you can easily deduce why that's true so I don't even know where you are getting this fundie angle from, since they honestly defend their views very poorly as well.
2) They are literally infants since that word means (from the Latin) that they are young humans that don't have the capacity for speech yet, which they are. And why should a child be punished for the crimes of another person? It's not the child's fault that they were born in such unfortunate circumstances, it's the rapists'. The child didn't magically impregnate the woman against her will, the rapist did. And no one said she has to raise it as well. That's why there are such things as communities and neighbors. If the trauma of the rape is that great, it would be best for the child and the mother that a close relative or a friend raises the child. At the same time, you shouldn't kill the child because of what someone else did. That's the peak of injustice really. That's essentially the equivalent to someone bringing you along for a ride, then he kills someone in broad daylight while you watch helplessly, both of you getting arrested and both of you sentenced to death. It is perfectly just and fine for him to die but you weren't an accomplice in the deed nor did you have any knowledge of it, It would make no sense nor would it be just to kill you in that instance.