victor, i'm curious, what sort of christian background did you grow up in?
as for jesus not being able to read well that is not what scripture tells us:
He [Jesus] went to nazareth where he had been brought up, and on the sabbath day he went into the synoagogue, as was his custom. And he stood up to read. the scroll of the prophet Isaiah was handed to him. unrolling it, he found the place where it is written:
The Spirit of the Lord is on me,
because he has anointed me
to preach good news to the poor.
He has sent me to proclaim freedom for the prisoners
and recovery of sight for the blind, to release the oppressed,
to proclaim the year of the Lord's favor.
luke 4: 16-19
as for your other objections, because jesus was preaching primarily to a jewish crowd he didn't need to reiterate every last word of the Law with which they were already quite familiar. we have to consider context when interpreting the bible. you might want to try reading old testament passages, specifically about the exodus where God led the israelites out of slavery in egypt. and the levitical laws where all sorts of sexual sins including child sexual abuse is strictly prohibited. eta: of course there were also the 10 commandments which made it quite clear that sexual activity was only allowed in marriage.
seriously dude, learn how to interpret the bible. not all interpretations are equally valid.