Abortion is not a solution for birth control. It is the killing of a human for convenience' sake.
If there are "too many people" in the world, then those people can use forms of birth control and self-control to not propagate more people. Killing a person after the fact is ridiculous.
Not everyone agree's with your religious definition of person. Nothing in this change says a person must get an abortion, just that government can't make the choice for you.
It's interesting how you support government interference in peoples lives when it furthers your religious beliefs.