I don't know any Christians who stigmatize unwed mothers or make them feel unwelcome.
I don't either. Unfortunately, I do know some that by their efforts NOT to "stigmatize" have gone all the way to another extreme - I'll call it indulgence - and in doing so have watched more than one unwed mother of one child become an unwed mother of multiple children.
Our church was very open to an unwed mother, until she had her second, and then third child, still unwed.
Nor do I. In fact, in our area, there are several places and organizations that help unwed mothers and they are all Christian.
Carolyn
I do not know any either. Being a life long member of the Methodist Church, I have also long supported the Methodist Unwed Mothers Home.