I read about this sometime ago. In the book ( can't remember the name of the book now), there are pictures showing proofs that Jesus had been to India to study Buddhism.
In the sutras, it's been said that out of their great compassion , some buddhas or bodhisattvas do manifest as teachers of other faiths. Reason being - all beings seek happiness and want to be free from suffering. When they make a sincere prayer to the holy beings, these high beings will take the appropriate manifestations according to the needs and dispositions of these people.
The main function of these holy manifestations will be to guide people to walk the small or medium scopes since only Buddhism teaches on the ultimate wisdom.
With the right causes created for future human rebirth and virtuous imprints planted on their mind streams; when the conditions ripen for them to meet buddha dharma , it would be easy for them to practice the dharma and continue with their spiritual journey.
Therefore , I'm not surprised at all if Jesus was indeed a Buddhist practitioner. His deeds were similar to that of a bodhisattva. What he most probably had done after learning the dharma from India was to disseminate the dharma in ways that were suitable to the people at that time in the region given their historical and cultural background. Even Jesus' miraculous powers can explained as the high attainments of spiritual practitioners of Hinduism and/or Buddhism.