Christ said that his miracles were testamony that He is who He said He is. Why can't a miracle be used now as a testamony of the existence of God?
"They went out from us, but they did not really belong to us. For if they had belonged to us, they would have remained with us; but their going showed that none of them belonged to us." 1 John 2:19 What does knowing anyone mean? It means you have had a personal relationship with them as opposed to merely hearing about them. There are many, many clues that scripture gives to indicate whether one is a genuine Christian. Firstly, they will believe scripture. Not all "Christians" believe scripture. They find a value in going to church, enjoy the fellowship, sing the hymns and do all the rituals that they think are a part of Christainity. But do they believe what is written, or what other people tell them. Jesus said: "If you believed Moses, you would believe me" But many, many Christians do NOT believe Moses. As you can plainly see here, they exchange what Moses wrote in Genesis for things that they find more believable. Secondly, if someone claims to know Christ then the fruits he will produce will be in accordance to those listed in scripture: "But the fruit of the Spirit is love, joy, peace, patience, kindness, goodness, faithfulness, gentleness and self-control." Thirdly, by believing that Jesus is the Son of God. (1 John 5:1). Not everyone "within Christianity" believes this. In fact their are quite a few priests (at least here in Sweden) that openly confess that they do not beleive this. If you think that these things are "my interpretation" then what other possible interpretation is there? I have no way to judge what your personal experiences were, but something that can be boiled down to an "imaginary friend" or some kind of fuzzy gut feeling is obviously not genuine Christian faith. No one would offer their own lives on the basis of a gut feeling. It has to be more. And before you start talking about muslims with explosives taped around thier bellies then I assure you, that doesn't negate what I am saying, because neither do they do what they do simply because they have vivid imaginations. No, they do it because there is a spiritual force that drives them, just as genuine Christians are driven by a spiritual force. I try to aviod going into details about my experiences on a public forum, but I can tell you this. As someone who had an extreme aversion towards Christianity, and yet converted in just a few days without human testimony because the evidence of God was so powerful, and the confirmation so undenialble, I absolutely did not convert because I simply imagined something. You say you want a miracle to convince you, despite the fact that the Bible warns against making such demands, and truly I say to you in all sincerity, you should be careful about what you ask for, because you just might get it, and although you might think that is a good thing, you should think again. Everything comes at a price. "To him who has been given much, much will be demanded". The apostles were shown an abundance of miracles, but they were all persecuted severely. Is that what you want, or are you just trying to put God to the test? Would you be willing to pay the price?
Were all the people that witnessed Christ's miracles and converted required to pay that same price?
Knowing something is true through whatever evidence convinces you will lead to belief. I have risked my life for my country because I had enough evidence if its worth that I believed I could die serving it. If I were to believe in Christ again, I think I could pay the price. One never knows until he is put to the test.