Leaving aside your apparent chronic gullibility, the risks of mistakes and lies (which includes people being 'duped') is your problem: it is for you to say how you have addressed these risks regarding the claims about Jesus that it seems you accept, since the burden of proof is yours.
If you haven't assessed these risks, or have concluded that it's now too late to do so, then these risks remain and are sufficient for some of us to just dismiss the supernatural claims (such as walking on water) out of hand.
Ok, I just wanted to clarify that being duped is included in mistakes and lies.
It's hard to claim that the gospel authors were mistaken. This is because they are accurate in so much of the fine detail. They know the most common men and womens' names in that place at that time (this has been confirmed by research). Common names are disambiguated (eg Simon of Cyrene), whereas uncommon names are not (eg Nathaniel). They know the types of tree that grew there, the times when grass would have been green, and when the barley harvest would have just happened.
So if they were competent in details like these, we can't accuse them of incompetence or gullibility in the area of witnessing miracles.
So that leaves dishonesty: were they very clever and making the stories up?
Incidental details can be evidence that they were simply telling us what they saw. For example, in the feeding of the 5000, in John 6, Jesus asks Philip where they could buy bread for the crowd. We wouldn't know why Jesus asked Philip in particular unless we had read Luke's account, which tells us that it took place near Bethsaida. We would also have to go back to John 1, which tells us that Philip was from Bethsaida (and so would know where to buy food).
For the two accounts to explain this otherwise irrelevant detail would be highly unlikely if they were making up the story.
Further, Mark and Luke tell us the method by which the 5000 were counted: sitting them in groups of 50 - about 8 groups per disciple. Would they be likely to make up this method of counting so as to make the story look authentic?
These examples suggest that they were writing what they, or their sources, saw happen.