1. The scripture you quoted was from leviticus, so that was towards the assembly of the Israelites. You have to remember also that Jehovah was way more active back then, when he would appear to them by angels and the many deliverances. So the more proof there is the more responsibility you have because you have experienced more.
2. What paul said is correct they will not inherit the kingdom. But there are individuals that didn't hear the kingdom message, so they will probably receive a resurrection from the dead. There are many reason why one might be pardoned, but in general if people have evidence of a god and they love the darkness rather then the light, that is on them, but even still, god will consider each individuals circumstances, everyone is different. Also there are several occasions in the OT were Jehovah did proclaim his name in the entire earth. So people did hear about his mighty acts, but chose to rebel, as well as some surrendered to the Israelites.