The least religious area in the country isn't California or the East Coast but the Mountain West and there you will find the Abortion rate equal to or better than anything in the Bible Belt.
And your point is?
The point is that an Atheist isn’t anymore likely to have an abortion than a Christian is.
Let’s not forget, there were no Atheist on the Supreme Court when they passed Roe v Wade, all 9 on the court were Christians. Not to mention even if they wanted to, there’s not enough Atheist in congress and the state legislators to stop all the Christians in power from passing a Constitutional Amendment banning all abortions, so it’s actually Christians who are keeping abortions legal in the country.