You really are going to talk to a 6 year old about abortion because it is real? I'm sorry but you are a sick person.
This is a straw-man argument.
Let's turn this around.
You're a substitute teacher. You've been given an assignment to present abortion as a normal way of family-planning (or homosexuality as a natural alternative to normal heterosexual relationships).
Do you:
1) Follow the lesson plan without question?
2) Follow the lesson plan, but explain the truth (about abortion or homosexuality)?
3) Quit.