Lets look at some of these evidences:-
1.Deliverances:Many victims of evil spirit possession or oppression have undergone deliverance sessions with very wierd displays that prove the prescence of spirit personalities.Some esterwhile shy gentle females speak eloquently with male voices,Some cry out with multiple voices or animal voices they can't muster ordinarily,some display violent animal personalities,some levitate.
2.Spiritual Hearing:Many satanic agents like witchdoctors,occultists etc clearly hear from spirits & as well christians many times hear God speak audibly to them telling them secrets or giving them instructions that are found to precisely conform without coincedence.
3.Miracles:This is the most numerous & most common evidence of the spriritual since creation till now & almost everybody have witnessed a supernatural solution to what physical methods can or cannot handle.Miracles of healing from curable or incurable sicknesses,death averted,miraculous provision, etc.
4.Revelations:Countless people have got revelations.How do we know the revelations people recieved in the bible days weren't just made up?We know because we recieve revelations today that bring accurate results.
5. Human Experiences:There are many individuals since creation began till now that have had first hand experience of the spiritual.Countless people most of which are still alive now who testified that they've been to heaven & hell with details that can't be denied & others that have been agents of satan with sticking details that graphically fit into what the scripture & present occurances on earth represent.
6. Prophesy:There are countless prophesies since time began that came fully accomplished as declared whether by satanic prophets or holy prophets.
7. Dreams:Millions of people have had dreams & insructions in dreams that came physically accomplished in precise accuracy.
8. Ritual & blood sacrifices:Many people have openly confessed to ritual / blood sacrifices they undertook in the past that brought them mysterious wealth exactly as the sacrifices prescribed.
9. Angels & demons:Many have seen angels & demons physically or spiritually.
10.Rain Makers:The existence of individuals that can magically manipulate rain to fall or cease is no longer new to us in this part of the world.So much so that construction coys & individuals are said to hire them to stop rain while consructing roads or during important occassions during rainy seasons.
11. Native witchdoctors(babalawos)Several people have used the services of witchdoctors and can readily attest that they are strong & common evidences that the spiritual exists.Infact it is nearly impossible to be in politics in this country without having a strong 'power' backup.
12.Occultic secret societies:Another common evidence of the spiritul where members who are normally among the highly placed in seats of political power in this country acquire spiritual powers.
These are a few evidences of the existence of the spiritual I can call to mind now.If anybody has more,he should add & all as many that have winessed any of the above evidences should testify.