Well heres something to chew on.Most people want something they can physically see as a means to prove to them that God is real,but this is a fallacy because that same person would most likely explain away what they've seen as something else just so that they can reassure the conclusion they already want to support.So i suggest looking at another aspect for proof of which converted me and thats the Bibles understanding of the human condition in how man is a slave to worldly lust and desires that seek to enslave them and eventually completely corrupt them and destroy any zeal they have for life or hope for peace of mind.So what is the human condition.It is the corruption of man that is inevitable to everyone on earth.
So say you decide that one of your goals in life is to be a good person.
When seeking to be righteous one quickly starts to notice how people tend to allow circumstances dictate there emotions.For example,this may seem inconsequential but it shows how subtlety you can be a slave to allowing certain emotions dictate how you act whether it be lust ,anger ,greed ect. Take for instance if you have a anger issue as i did and You"ve come to the point where you recognize it in yourself as a problem but you quickly find that even though you declare in your heart your going to change .you quickly fail when a circumstance catches you off guard and you lose your cool.
After many failures you become hopeless in that you have no control from allowing your emotions to control your actions.This is the stage at where i finally realized that in my own strength i could not overcome these things and i questioned whether that anger was who i really was or was there more going on in my mind than what i was not aware of.This is where i read about the war going on in my mind.
Ephesians 6:12 For we wrestle not against flesh and blood, but against principalities, against powers, against the rulers of the darkness of this world, against spiritual wickedness in high places.
So then that is when i realized that every thought in my mind was not my own.For if i determined that if i didn't like being angry then the anger was not who i really was but merely the temptation of the flesh(which is the corrupt nature inherited from the curse on Adam).
Romans 7:14 For we know that the law is spiritual: but I am carnal, sold under sin.
15 For that which I do I allow not: for what I would, that do I not; but what I hate, that do I.
16 If then I do that which I would not, I consent unto the law that it is good.
17 Now then it is no more I that do it, but sin that dwelleth in me.
18 For I know that in me (that is, in my flesh,) dwelleth no good thing: for to will is present with me; but how to perform that which is good I find not.
19 For the good that I would I do not: but the evil which I would not, that I do.
20 Now if I do that I would not, it is no more I that do it, but sin that dwelleth in me.
21 I find then a law, that, when I would do good, evil is present with me.
22 For I delight in the law of God after the inward man:
23 But I see another law in my members, warring against the law of my mind, and bringing me into captivity to the law of sin which is in my members.
24 O wretched man that I am! who shall deliver me from the body of this death?
25 I thank God through Jesus Christ our Lord. So then with the mind I myself serve the law of God; but with the flesh the law of sin.
So after recognizing who i really was the next problem was how to over come that which i don't approve of.I tried for years in my own strength but failed miserably.
Thats when i finally out of really desperation placed my Faith in Christ to help me overcome the sin that had dominion over me.It was then that i started to not be troubled by some fleshly desires.
2 Corinthians 12:10 Therefore I take pleasure in infirmities, in reproaches, in necessities, in persecutions, in distresses for Christ's sake: for when I am weak, then am I strong.
Now mind ya not all went away,it seemed just enough to show me that i was pursuing the right direction.Some things have taken years to overcome and when one area is no longer in control of me im made aware of a new thing ,of which i know why i will never be completely sinless based on this verse.
Ephesians 2:8 For by grace are ye saved through faith; and that not of yourselves: it is the gift of God:
9 Not of works, lest any man should boast.
10 For we are his workmanship, created in Christ Jesus unto good works, which God hath before ordained that we should walk in them.
so now its a life long process towards being Christ like, but i have the confidence that whatever i want to overcome now i can because of faith in Christ. Whenever i start to waiver im reassured in this verse
Philippians 1:6
Being confident of this very thing, that he which hath begun a good work in you will perform it until the day of Jesus Christ:
So the point i hope you take away from this is that not all proofs are things you can see but a proof can also be from a revelation written down which describes the corruption warring in every human of which explains the depravity that infects every bit of life that man is involved in.