Not a liar. But the story that was passed on orally and than finally written down was pinned through the lens of a particular belief and may not have been said by Jesus at all.
Well why do you believe what you believe? Did someone tell you about those things before you believed it? Is it written in a scripture? Whether you learned it orally or by scripture, how do you know that what you learned is true? This could be said about any scripture or teaching, and therefore it isn't a good reason not to believe. (Or else it's a good reason not to believe anything from any scriptures.)
But as for Jesus' disciples writing the account of His resurrection and etc based on a particular belief, why would they have that belief if He hadn't taught it? And as far as the resurrection in particular, they didn't believe that He was going to rise again, even though He told them repeatedly.
Here's just a couple examples of that.
John 20:25
The other disciples therefore said unto him, We have seen the Lord. But he said unto them, Except I shall see in his hands the print of the nails, and put my finger into the print of the nails, and thrust my hand into his side,
I will not believe.
Luke 24
13 And, behold, two of them went that same day to a village called Emmaus, which was from Jerusalem about threescore furlongs. 14 And they talked together of all these things which had happened. 15 And it came to pass, that, while they communed together and reasoned, Jesus himself drew near, and went with them. 16 But their eyes were holden that they should not know him. 17 And he said unto them, What manner of communications are these that ye have one to another, as ye walk, and are sad? 18 And the one of them, whose name was Cleopas, answering said unto him, Art thou only a stranger in Jerusalem, and hast not known the things which are come to pass there in these days? 19 And he said unto them, What things? And they said unto him, Concerning Jesus of Nazareth, which was a prophet mighty in deed and word before God and all the people: 20 and how the chief priests and our rulers delivered him to be condemned to death, and have crucified him. 21 But we trusted that it had been he which should have redeemed Israel: and beside all this, to day is the third day since these things were done. 22 Yea, and certain women also of our company made us astonished, which were early at the sepulchre; 23 and when they found not his body, they came, saying, that they had also seen a vision of angels, which said that he was alive. 24 And certain of them which were with us went to the sepulchre, and found it even so as the women had said: but him they saw not. 25 Then he said unto them, O fools, and slow of heart to believe all that the prophets have spoken: 26 ought not Christ to have suffered these things, and to enter into his glory? 27 And beginning at Moses and all the prophets, he expounded unto them in all the scriptures the things concerning himself.
Sorry for that one being long. It just kind of needs to be in context to get the gist of it.
So they didn't have an expectation of Jesus rising from the dead. They are all distraught, thinking that was still dead. And even when He prophesied His own death and resurrection, they didn't understand.
Mark 9:30-32
30 And they departed thence, and passed through Galilee; and he would not that any man should know it. 31 For he taught his disciples, and said unto them, The Son of man is delivered into the hands of men, and they shall kill him; and after that he is killed, he shall rise the third day. 32 But they understood not that saying, and were afraid to ask him.
Luke 18:32-34
32 For he shall be delivered unto the Gentiles, and shall be mocked, and spitefully entreated, and spitted on: 33 and they shall scourge him, and put him to death: and the third day he shall rise again. 34 And they understood none of these things: and this saying was hid from them, neither knew they the things which were spoken.
And when the angel told them, he had to remind them of what Jesus told them, and then they remembered.
Luke 24:6-9
6 He is not here, but is risen: remember how he spake unto you when he was yet in Galilee, 7 saying, The Son of man must be delivered into the hands of sinful men, and be crucified, and the third day rise again. 8 And they remembered his words, 9 and returned from the sepulchre, and told all these things unto the eleven, and to all the rest.
And not to mention all the tortures and death that His disciples willingly endured, and not only them, but thousands of others who were saved afterwards.
You could say it would be a blessing to have seen Jesus after His resurrection.And I'm sure those who did felt that way. But Jesus said that those who didn't see Him and still believed were the ones who were really blessed.
John 20:26-30
26 And after eight days again his disciples were within, and Thomas with them:
then came Jesus, the doors being shut, and stood in the midst, and said, Peace
be unto you. 27 Then saith he to Thomas, Reach hither thy finger, and behold my hands; and reach hither thy hand, and thrust
it into my side: and be not faithless, but believing. 28 And Thomas answered and said unto him, My Lord and my God. 29 Jesus saith unto him, Thomas, because thou hast seen me, thou hast believed: blessed
are they that have not seen, and
yet have believed.