The mormons have that covered...they baptize the dead by proxy and then perform the ordinances required by the LDS for that soul to reach "exaltation", or the mormon version of Heaven. They baptize EVERYONE, regardless of prior baptisms or lack of same. That includes Jews, Hindus, Scientologists, Hitler and the Popes. And the descendants have no say in the matter.
I never have been able to get anyone to tell me how the LDS church collects tithing from the dead, though. 10% tithing is required of the living in order to partake of the special "ordinances" required for "exaltation".
So they can do it to others and their family has no say in the matter? That takes..... well... guts, shall we say?
What about those poor souls who know one knows existed because birth records were lost or never kept?
What’s the point of even becoming Mormon if one can have it done by proxy?