Which preposition to use with backsliders

in Occurrences 4%

They are educated and to an extent cultured, being "gentlemen born" but sad backsliders in the practise of the profession.

as Occurrences 1%

And if the white visitors treated his fervent appeals to the unconverted and backsliders as part of the program, but having no slightest application to them, this was also the regular thing, and nobody was troubled thereat.

from Occurrences 1%

Hawthorne's Zenobia, who, for all her emancipation, drowned herself in a fit of amorous jealousy, was no greater backslider from the true path of woman's advancement.

Which preposition to use with  backsliders