Boteach is completely full of himself (well, full of something). He loves controversy and the attention it gives him.
With regard to some of the other comments above, I think it is inappropriate to comment on who or what Jesus and the religion founded in his name is or isn’t or if he even actually existed. Our tafchid is to follow the ratzon HASHEM as laid down in his Torah, Shas and poskim. Our only interest in someone else’s religion is what it’s status is vis a vis avodas zorah as paskened by Chazal.
P.S. There are ma’amrei Chazal to the effect that Peter and Paul were actually shiluchei beis din with the mission to subvert the early Christian practice to separate it from Judaism.