The problem I have is with people that, for example, would say that their partner loves them because they kiss and hug them and they don't yell at each other, accepting this as hard evidence enabling a life decision such as marriage, while insisting that people's religious experiences are all useless as evidence. Why not believe the person kisses and hugs them in order to get something from them instead? They choose a belief based on their reading of some behavior as explained by cultural reference. So when someone rolls on the floor in religious ecstasy (supposedly religious at least), some people accept a cultural reference from their religious group, and call it evidence of god's spirit. This is the exact same process being used in both cases, in order to hold a belief in an inscrutable idea, whether it be the existence of god, or the existence of true love in another person's heart.
I would suggest that there is a category difference between God and love in this regard, but depends upon how one defines each.
You need to ask the empiricist what they mean by love when they make such a claim as "my partner loves me", as they might view it merely in terms of the practical, observable actions, and an assessment of probability as to what their partner would do in a given circumstance.
That their partner loves them they would base on the countless examples of such behaviour (beyond mere holding hands, not shouting etc) as well as, undoubtedly, the chemical reactions in their body that indicate attraction (the increased heartrate etc).
Depending on how one defines god, I would argue that love is of a different category to God, where all you have for reference is what you have been told.
The empiricist would not deny the experience (the evidence suggests there was) but merely the interpretation of it.
I have a hard time understanding why one person gets to draw the line and say, "this evidence is solid, yet this evidence is junk", other than for their OWN ideologies. I understand the difference between scientific evidence and non-scientific evidence, but must insist that people are not actually able, for the most part at the very least, to rely on scientific evidence for philosophy of any kind.
On the whole they don't, which is why most who hold such philosophies would also be agnostic on the matter of god's existence : they are not saying that because there is no evidence it does not exist, but that because there is no evidence they do not hold it exist, but neither do they say that it does not exist.
Even basic morality is dependent on cultural references, at least for all people that do not insist upon "god's morality", and even those people may in actuality be in truth depending on the cultural reference anyway.
Depends again on how you view morality. If purely subjective (albeit a shared subjectivity within the culture) then there is no "truth" in actuality, only a truth in relation to your culture (from which the morals arise).