In part, yes. Dostoevsky himself said, in a letter to his niece, that the idea of The Idiot was to portray a positively beautiful man, and that among the literary precedents he cited for this figure were Don Quixote and Mr. Pickwick, who work because they are ridiculous. The comparison with Christ is a reading of the text, and the text gives reasons for it.
Don Quixote is inside the book. Aglaya keeps the prince's note in a copy of Don Quixote and bursts into laughter when she sees which one it is; afterward she says of the ballad of the poor knight: "The poor knight is the same Don Quixote, only serious, not comic." The knight, who believes in his lady "even if she later turned out to be a thief," stands for Myshkin's fidelity to Nastasya.
The reading of Christ rests on traits in the text: Rogozhin tells him "and people like you are the ones God loves!"; he takes a slap and, without striking back, says the other will be ashamed; he accepts suffering on another's behalf and, at the end, strokes the murderer's head. But the book also shows Holbein's Dead Christ and the Christ with the child that Nastasya would paint, two images the prince does not resolve.
There are two readings. For some, Myshkin is an image of Christ in a world that does not receive him. For others, he is a serious Don Quixote, whose goodness saves no one, and the strongest objection is that a good man who is only incapable of cruelty would be harmless, not virtuous. The text gives material to both.