You are not guilty of anything.
Your mother chose to raise her kids in a church with a history of not having a god that ever bothers to show up to fulfill promises that it's leaders pretend they make on its behalf. This is a risky gamble, because if the god doesn't show up, or the leaders change the god's promises for it, it is highly likely that the kids will eventually realise that the church leaders aren't the channel of communication parents have been telling them they are.
She took a gamble. It didn't pay out. The god never showed up. The church leaders had to change the god's promises. Her kid lost faith in the church leaders and doesn't want her kids following the same bunch of loosers.
Now your mother has to pay the price and it is up to her what price she is prepared to pay. That is her choice .... not yours.