You place no constraints upon what constitutes 'proof' or 'evidence'?
Not at all. What constitutes good proof or evidence depends on the nature of the question being asked, why the question is being asked, and how the answer to that question is going to be applied.
When working within my field (science), I obviously adhere to the requirements of evidence for the purposes of scientific investigation. That means evidence is limited to something that can be measured and quantified, and proof involves testing these measurements for statistical significance. It is foolish to apply this test to all sorts of questions, both because to do so in some situations is absurd and because certain ideas and concepts transcend quantification.
When working with religious/spiritual questions, a broader range of things can constitute as evidence or proof. Personal experience is a significant one. I don't ask that others accept my personal experiences as evidence for something or believe in anything I arrive at due to those experiences, but I do like to expect some basic level of respect. Simple logic is another, and also something I don't expect others to accept because inevitably, all logical arguments rest upon premises that can be disputed. Others use the authority of a sacred text or religious leaders. I don't, but for those that do, go for it. That's your evidence; that's your proof.
If you choose to find the divine, you will find it. If you choose not to, then you won't. It's a matter of how your worldview is constructed. Being fundamentally agnostic on all questions of knowledge, I'm not the sort to claim anything as "The Ultimate Truth" or some such nonsense. Each must find their own path that offers meaning and purpose in their lives.