It more amounts to whatever I think is true, I believe is true. If I have reasons to think something and then I believe it, isn't the belief based on reasons?
Where do "think" and "believe" seperate?
No it is based on assumption.
Without real evidence, empirical evidence, anything else is speculation and assumption. Some speculation and assumption is valid and some is not.
Assumption of the ordinary and mundane is ultimately based on repeated empirical experience.
Assumption of the extraordinary and spectacular (omniscient omnipotent beings, everlasting etheral souls etc. etc.) frankly borders on the delusional.
Apart from anything else you are misusing the word evidence.
Evidence is how we differentiate between that which is true and that which is not. If a form of evidence can equally support two mutually exclusive conclusions either, or neither, of which may be true then it is no sort of evidence at all.
You "feel" that you have a soul. (Lets assume) I "feel" that you have no soul. The "evidence" is equal and opposite. It is not evidence. It is assumption with regard to subjective feeling on both counts.
The use of the word "evidence" is being used to legitimise things which do not warrant that claim. Evidence is not just something that can be used to suggest both the truth and falsehood (plus anything in-between) of any iven claim.
You should see the "Probability of God's Existence" thread regarding this topic as this one and that are converging on the same areas.