The OP seems to be asking whather God performs miracles today and what our role might be.
I believe that God performs miracles today in many ways. But more important in some sense is our role. We are not to accept Jesus and sit around and wait for heaven.
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I believe that Jesus has risen (indeed he has risen) and that he has left the Holy Spirit within us to perform miracles through us. As Therese of Avilla put it (from wiki),
"Christ has no body now but yours
No hands, no feet on earth but yours
Yours are the eyes through which He looks
compassion on this world
Christ has no body now on earth but yours."
As Tony Campolo observed,
Jesus says to his disciples, even as he says to you and me
"The work that I do, ye shall do and greater works than these shall ye do because I go unto my Father." John 14:12. May each of us live out this verse and may it be said of you, he did, she did the work that Jesus would have done if Jesus was here in the flesh. It’s in that context that we have authority when we declare the good news of what Jesus did for us on the cross. May God bless us and do great things through each of us in his name.
Tony Campolo - Doing Greater Things
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When we ask "What Would Jesus Do?", we should be serious. We are to be Jesus to the world. We are to heal, to take care of the sick and the weak among us. We are to allow the Holy Spirit to act through us.
We are adopted daughters and sons of the living God: we should act that way. As we mature, and are more like Jesus was on earth, then it makes sense that we will be able to do as he did.