Not really. Pro-life leaders like Gregg Cunningham have been saying that for a long time (20 years!). He would quote a pro-abortion leader saying something similar, and then say that was true.
George Grant wrote a book about Planned Parenthood in the 1980s...he mentioned when abortion records were found in a dumpster outside an abortuary (TX, I believe)...they did a random sampling of the records and found a high % of women who had listed some affiliation to a specific church & pastor.
So the pro-life movement has known this for the past 25 years at least that a high % of women/girls who were getting abortions were members of various Christian and non-Christian counterfeit churches. I've heard a number of speakers reference all this in the early to mid-90s.
One clarification, though...I'd say the % you claim is more in the upper 60s...NOT 90% as you said...although I have no doubt that such a % climbs another 20% in many cities.
Also...to belie your claim that the pro-life movement is in denial about this as it pertains to personhood amendments like this...the LA Times a very long time ago had a poll where a majority of people conceded abortion was murder, but they wanted it legalized, anyway.
Once the frontline groups came along and started putting pictures of aborted babies in political campaign TV commercials (circa 1989-1990) people in this country could no longer claim stupidity or ignorance re: NOT knowing abortions kill baby PERSONS.
Now how is this last polling data relevant to this?
For 21 years people have been comfortable calling abortion murder but still wanting it legal. (They haven't been in denial about that at all; they've been forthright enough to speak it into polling questions when asked)
So this vote reflects the same thing...I would surmise, based upon other polling data, over 1/3rd of Colorado voters who voted against the personhood amendment, if asked, would tell you abortion is murder. IOW, they'll tell you the amendment they voted against does indeed effect living persons...they just want the right to be able to dismember those living persons if it comes down to that.
The pro-life movement indeed recognizes this. People are indeed ethically utilitarian, even when murder is being discussed.
It sounds as if there are many more hearts that have to be won over at the retail level.