Hebrews ch.11 v.6 lays down an important challenge to all who claim to believe. It is not enough to believe that God merely exists. People often quote James ch.2 v.19 at this stage in a discussion on faith – which makes the same point, but in a very different way.
In their case, demons are not expressing an academic opinion on whether there may or may not be a Creator of the universe. They are well aware of the truth behind that. Instead – they have gone one step further, having translated their faith into action, they tremble with the anticipated fear of their impending judgement.
Similarly for us – the question becomes not – do you believe in God, but what sort of God do you believe in?
Is your God one who will judge without mercy?
Is your God one who will be fickle, inconsistent, merely because He can?
Or has your God revealed Himself to be consistent, a rewarder of those who seek to do His will on earth?
It is this arean where doubt actually becomes a useful tool in purifying our faith – where we critically examine our thoughts and experiences and question our assumptions – not on the subject of God’s existence – but to ensure we have fully grasped the depth and complexity of His nature.
If our concept of God is at fault – it is our duty to use doubt to excise those imperfections in order that our view of Him becomes clearer. By doing so we receive our reward – a deeper, more authentic fellowship with the Lord of Creation, a greater insight into our purpose in His universe.