The reason why so many find it difficult to believe in the supernatural side of Christianity is our Western mind set which has been corrupted by the pagan philospher Plato in the third century, whose teaching caused many Christians to put the supernatural on the back burner in favour of rhetoric to win people to Christ. Also in the 9th century a teaching emerged that sickness is a cross Christians must bear as part of their suffering. This is not taught in Scripture at all. Christian suffering is persecution.
Also, the great enlightenment of the 18th Century put the emphasis on scientific proof as evidence of reality. This put the kybosh on the supernatural once and for all.
So, this is why our experience in Christian things does not include the supernatural, so we interpret the Gospels and Acts on the basis of our experience. Because we have not had personal experience of the supernatural signs and wonders in our churches, we then believe that although they existed in the Book of Acts, they no longer exist today. This is a belief based on experience, or lack of it, rather than what the Scripture teaches.
We believe that God still acts and moves, but not in the way that the Gospels and the Book of Acts describes, because of our Western mindset. If we went to Africa and South America where that mindset does not exist, then we would have quite a different experience, because signs and wonders in the Christian church are the common experience of Christians in those lands.
Also, because African and South American countries still worship pagan gods in many areas, there is a lot of demonic supernatural events (fully documented by reliable authorities), and so to bring these pagans to Christ, the church in those countries have access to the supernatural gifts of the Holy Spirit. Nothing less will bring them to Christ. Mere man's wisdom has no hope of competing against demonic power in these countries.
Also, in our countries, because the supernatural God of the Bible has been pushed out of our societies and many of our traditional churches, there is a gap left, and because people are hungry for the supernatural, the occult is experiencing a revival. All you have to do is look around you to see how occult practices have mushroomed in the last 20 years. People involved in the occult believe totally in their own version of supernatural signs and wonders, and this was predicted to happen in the last days.
So, without signs and wonders what has the Church got? Just the enticing words of man's wisdom, and we know that Paul the apostle would never have been satisfied with that when he preached the Gospel. In the light of the power of the dark side in the occult today, trying to preach the Gospel with just words is a sign of a powerless, declining church.
Many areas of the Christian church are retreating in defeat before the tide of the demonic and occult that is taking over our society, sadly because Christians are choosing not to believe that Jesus Christ is more powerful than the occult and is able to demonstrate His power by the Holy Spirit through them.
As I said in another post, this is not Pentecostalism or the Charismatic. There are many traiditional churches discovering the miraculous power of God and who are experiencing instant healings and victories over the demonic. It is not that they have become Pentecostal with its accompanying excesses (in some churches), but that they are finally starting to obey the command of Jesus in His Great Commission: "Preach the Gospel, heal the sick, cast out demons."
We need to change our mindset and start believing that the signs and wonders can and will happen today. Jesus is still able and willing to heal the sick instantly, as He was in the Gospels. When we start believing that, then our experience will change. Jesus has observed us for a long time to see what we have been doing, now He wants to show us what He can do, if we will let Him.