<<He converted to LDS as part of his recovery.>>
That doesn't alter my point that not every Mormon or Baptist adheres to all the tenets of their respective religions. If I had a buck for every Baptist that violates their preachings against extra-marital sex, I'd be a very rich man. Belonging to either religion is no guarantee that either of them tithes or observes any of the other religious tenets and even if they did, the only comparison worth making with Biden is what percentage of their income is given away versus what percentage of his.
Besides which, some of the charitable donations if made to Church charities, could just be another way of buying power. They give to their own base, become trustees of their own charitable funds and acquire name recognition and support in two very powerful and politically active churches which are capable of providing invaluable assistance at key points in the election cycle.
I'm not impressed with any of these guys, and I don't see why Biden has to get into some kind of giving contest with them, even if he'd probably win it against Beck, Limbaugh and McConnell.