When have I ever said otherwise? It is you who can't stand that other people have different opinions, it's obvious in this very post you've just made.
Not at all. You have every right to an alternative opinion. What you don't have is the right to impose your opinion in law. The idea is this. Some people do believe that a "conception" is a person. Some others believe that an embryo is a person. Still others believe that a pre-viable fetus is a person. And still others believe that a viable fetus is a person. But everyone believes that a newborn is a person.
We know that, at the time of the founding of the US, it was not a widely held belief that a fetus was a person because, in the one comprehensive work on English law widely influential in America, that of Blackstone, induced abortion was definitely not murder, and that means a fetus was not considered a person.
There is evidence, moreover, that the use of herbs to restore menstruation when it was "blocked" was widespread and the remedy was even included in a handy pamphlet for do it yourself health care published as part of Ben Franklin's work on do it yourself math.
There is not one piece of evidence that the founders or, indeed, the Constitution or its federal court applications ever recognized a fetus as a person. That was restricted to those born alive.
Hence, the appropriate legal definition of person in the US is restricted to those born alive. If there are individuals who want to believe otherwise, that's their business. But they have no warrant to impose that belief on others.
Hence, in this country, it's appropriate to let people believe what they want about this issue, but it isn't appropriate for them to impose any definition that would restrict abortion by virtue of that belief.
That is my understanding of the meaning of tolerance - believe what you want but the law imposes the one definition of person on which we universally agree.
The notion that legislatures of states have a right to claim that abortion is murder in light of existing Constitutional law is not correct. And what I can't stand is someone trying to impose it in law or even in Biblical morality, given the fact that the Bible admits of more than one interpretation on this issue.