So is divorce the unforgivable sin? haha
Regarding some of the comments on baggage, majority of people are highly selfish christians included, so of course they aren't going to accept someones baggage unless they packed it together.
For the rare ones that are highly unselfish they might have much more room to help someone carry that load, but even they probably have in the past been burned way to many times, where they just dismiss people with certain baggage.
I know personally from a decade+ long relationship with someone with mental health issues, I would 99% never be in a relationship with someone who suffers from them, well let me preface mental issues that effect the significant other, not if it only effects that person and it doesn't flow to the other.
Same with children, I grew up with just my mom, and I saw how I was the priority in her life where it might of even been unfair to the guys she was dating. Majority of women are like this of course they are going to choose their own child over a strange man. Most man know this and they just don't want to bother with it. Nobody likes feeling left out / neglected, the first slight will cause her to get defensive and whole arguments can start around the child, coupled with not even my own blood = recipe for disaster.
Women also want men that can provide for them and yada yada. Moral of the story with imperfect beings + baggage you didn't help pack = a lot of single people haha.