First I should say I don't find atheism a 'miserable alternative'. But a couple questions:
(Dart) but because I cannot ignore my own religious experiences and blow them off as delusion.
Whoa! OK. Now....here we go. What were they? What was the content? What did you bring down from the mountain so to speak?
The concept or perception THAT God exists. I really don't understand the controversial nature of Dart's statement of belief that god exists. I don't want to speak for him but, he seems to indicate a 'perception' that arises in us as a basic or fundamental belief. Our basic and fundamental beliefs are unprovable of course but they arise in us as basic acts of acknowledgment as a direct bearing of our mind upon reality in a basic act of cognitive assent or acknowledgment. Disagreeing with the corresponding reality of this innate basic act is certainly a possibility but addressing it as a mere fancy is unsatisfying and dismissing it doesn't fully address its irrationality either.
Second, I would suppose the religious experiences of such a fundamental nature could contain conceptual understandings such as my life has meaning, God loves me etc... The existence alone of these fundamental convictions count as evidence, although no one is compulsorily compelled to them. A conception of WHAT is not required or dismissive of a perception of THAT.
And then there is also the matter of teleological evidence that no atheist has been able to address.
OK, give the evidence so we can see for ourselves.
I could be wrong but most of what I have read Dart saying regarding the teleological evidence for a designer are of the form of we observe the coming into existence of humanly designed artifacts, and by some type of abstraction we notice certain commonalities among them. We then infer that those constitute generally reliable marks of design and we then inductively extend this generality to things in nature, thereby identifying relevant things as also designed.
But, if one takes a more Reidian or perceptual approach to this another level of confirming evidence is provided. If 'design' is perceived then Dart is on to something that the scientific discoveries can be confirming evidence (even if not compelling evidence) of the corresponding same belief that perceptual arose in our faculties.
Anyway those assumptions, if they be there, are no more irrational than the assumptions of multiverses or the assumption that more than one kind of life can come into existence as the article you posted assumes in order to argue against what Dart argues for. So one could ask you the same question, give the evidence so we can see for ourselves.
my regards, mikwut