Many claim that the miracles recorded in the Gospels (Matthew, Mark, Luke, and John) were legends, added later by believers who were simply exaggerating the life and claims of the historic Jesus.
Author and apologist Greg Koukl puts this assertion to rest:
"There is no "new evidence" supporting the idea that the miracle-working Son of God was the result of an evolution of myth over a long period of time. To the contrary, recent discoveries have given more credibility to the content of the Gospels themselves.
For example, we know the Apostle Paul died during the Neronian persecution of A.D. 64. Paul was still alive at the close of Acts, so that writing came some time before A.D. 64. Acts was a continuation of Luke's Gospel, which must have been written earlier still. The book of Mark predates Luke, even by the Jesus Seminar's reckoning. This pushes Mark's Gospel into the 50s, just over twenty years after the crucifixion.
It is undisputed that Paul wrote Romans in the mid-50s, yet he proclaims Jesus as the resurrected Son of God in the opening lines of that epistle. Galatians, another uncontested Pauline epistle of the mid-50s, records Paul's interaction with the principle disciples (Peter and James) at least 14 years earlier (Gal 1:18, cf. 2:1).
The Jesus Seminar claims that the humble sage of
There is no good reason to assume the Gospels were fabricated or seriously distorted in the retelling. Time and again the New Testament writers claim to be eyewitnesses to the facts. And their accounts were written early on while they’re memories were clear and other witnesses could vouch for their accounts. The Gospels are early accounts of Jesus’ life and deeds." 
The follower of Christ has solid grounds to believe that Jesus' miracle accounts are historically reliable.
Courage and Godspeed,
Chad A. Gross
1) Greg Koukl, A Short Argument for the Early Dating of the Gospels, http://www.str.org/site/News2?page=NewsArticle&id=6760.