That 'God' exists is evident from people's reaction to His word - commands, teachings and promises - and His personified Word - His Christ; past and present.
This 'God' has revealed Himself. This is seen especially in His Christ whom he sent, called on Earth 'Jesus of Nazareth', but it is also seen in the giving of the Law to Moses and in miracles and prophesies given throughout the history of humankind. God has revealed Himself to be a 'spirit' and so at least one spirit exists but many believe that spirits other than God also exist and that humans have a spirit along with their mind and body, even though it might be dormant in many. Spirits are of various kinds and called various names according to their kinds and according to various local customs and beliefs too. Some spirits are loyal to God and in ancient writings God is called 'the Lord of Spirits'. Some spirits have abandoned loyalty to God.
All this is evident in the believing response of people to teachings from God (and evident most in the loving nature of the works of such people). It is especially evident in the teachings of the Christ and the believing response of so many to those teachings and to the Christ Himself.
A region surrounding the planet on which we live, Earth, demarcated by the clouds and stretching upwards above them is a region especially associated with spirits loyal and obedient to God. It is called 'Heaven' and 'the heavens' (or the equivalent in other languages). It is distinct from a region below the clouds and above the ground of this planet which is called 'the air' and which is associated with spirits disloyal and disobedient to God. Other spirits are also known which are called ghosts. (When I say 'known' I mean known to exist in 'folk' and personal knowledge, though not as yet in what is called 'scientific' knowledge which is collective and depends on physical methods of observation and deduction and academic methods of peer review and refutation.) Ghosts are believed to belong to people now deceased and these spirits are often associated with the ground region of the planet, particularly believed to wander lonely places and to haunt houses, especially otherwise uninhabited buildings. Some especially troublesome ghosts are called demons and are associated with illnesses they are believed to cause in humans and animals.
The teachings of the Christ emphasised the need to escape eternal death by becoming loyal, obedient and trusting towards God and His teachings and so to become associated so much with the region and Kingdom of Heaven that you are called a child of God and one born of God, born of the Spirit of God. The Spirit of God is a special spirit known from ancient times to prophets of God who has been sent be God after the departure of His Christ. This Spirit is the means by which a person is made sufficiently loyal to God that they are called a child of God and a citizen of Heaven, just as spirits loyal to God are associated with Heaven too.
Loyalty to God which comes to people from God's work in them by His Spirit means two things in particular; loyalty to God's teachings and loyalty to others loyal to God. To experience the Spirit of God is a means of progressing along this path towards eternal life. It is therefore essential to identify any spirit you experience as to whether it comes from God or whether it is a spirit disloyal to God. This is mainly by the teachings of the spirit with regard to the Christ, whether it acknowledges the Christ truthfully. Allowing the Spirit of God or spirits loyal to God to work in you helps you progress towards God's will and to be transformed mentally into the kind of person who can inherit God's rewards of eternal life. This is the only way to become such a person. Human endeavour alone is really insufficient, though it may be noble and may bring a person into a place where they are ultimately blessed by God so He gives them His teachings and His Spirit causes them to believe. So it is worth every effort to work towards the Kingdom of God but in the end it is only the work of God's Spirit that creates a true believer: A true believer is a new creation of God. Hence the term 'born of God'. "Flesh gives birth to flesh but the Spirit gives birth to spirit." The spirit of a believer can be brought to life by the force, the influence, coming from the Spirit of God when He hovers over that person. I've had some experience of it myself and of course it is awesome in the extreme and in my case resulted in a coming alive in me of a power I had never known before. That was probably actually on several occasions, as far as I can tell with different effects each time. One time in particular resulted in me being made aware of truth I had not known before which led me eventually into a sublime knowledge all kinds of other truth, some of which eventually resulted in my writing what I write. This fulfills all sorts of promises from throughout history made by God through prophets and the Christ. And all because Christ fulfilled God's will by dying and rising to new life, buying for God a people fit to do His will. So, if you haven't already then take to heart the Apostle Peter's exhortation, "Repent and be baptised every one of you in the name of the Lord Jesus and you will receive the promise of the Holy Spirit." The promise is to everyone far and near, to all whom the Lord our God will call, both Jew and Gentile, slave and free, rich and poor. Take the Lord's Word to heart: "Now that you know these things you are blessed if you do them."
