At the end of the day, they're both human made.
Let's look at it, not from the Ominous Subject of God. Let's whiddle it down and see how they're both made up Narratives, each equally stubborn in its attachment to itself (I say, a built-in attachment but that's for another discussion).
Whiddled down, they both reveal their Fictional natures, stopping short of Truth, necessarily incapable of surpassing the final leap which inevitably settles at belief. (And this applies to theism/atheism).
Take. You believe, not necessarily that Jesus of Nazareth is God, but even if it comforts you to dilute the myth, and say, that he preached love your enemies to the poor and was executed by Rome. You don't know that for certain, but it was revealed to you by the Christian Bible, has been input into you since childhood, and seems to have been adopted by enough people that it is safely a convention. It is still mysterious and you don't fully understand it, but still you took the leap, even if opposing Signifiers reawaken the Dialectic from time to time.
Now take. Water is made of two hydrogen and one oxygen atom. You don't know that for certain, but it was revealed to you by the Scientists, has been input into you since childhood, and seems to have been adopted by enough people that it is safely a convention. It is still mysterious and you don't fully understand it, but still you took the leap, even if opposing Signifiers reawaken the Dialectic from time to time.
Ah, but the Science Narrative demurs, our belief is supported by observation and can be tested by experience. Maybe not everyone can or has tested it, but we have authorites which confirm it.
And so too does the Jesus camp. Our belief is supported by witnesses and can be tested by experience. Maybe not everyone can or has tested it, but we have authorites which confirm it.
And it is only because we stand from within the Science Narrative that we reject religion's right to make all of the same claims. From Religion's perspective, using their tools and definitions, their claims are tested everyday and prove to be true.
Yet all along, both are wrong. Neither is ever proving to be true. Both are constructing opposing Narratives out of tools particular to each, but in common, uaing the same Mind, and its same structure, Language; and, both require at the very last instance of the Dialectic, a settlement, and a leap to belief in that settlement as if it were True (thats built-in--by its evolution. But for another discussion).
And why should it be any different when we get way up there at God? Theism/Atheism, they're both Fictions, and Philosophy should at least, recognize that, just as it should recognize it in Itself. Afterall what is Logic and Reason, but made up tools constructing Narratives which can never be called True.
Test it. If you think anything I've said is true, isn't it because you believe it? And If you think anything I've said is untrue, isn't it because you believe something opposing?
At the end of the day... breathe. And let them each present their cases for belief.
But for God's sake, let them each present their cases.