Law vs Grace

"...because they sought it not by faith, but as it were by the works of the law..." (Rom. 9:32). "He bore record to the fact that the Jews had a zeal of God but that their zeal was not according to the right knowledge of God."

I find that incredibly frightening, that a Christian, yes a Christian, a born again Christian can be zealous for God but not have the right knowledge of God...but surely Craig it doesnt matter God will still bless that man etc....sure, but it also says God cannot be mocked, a man reaps what he sows...if he sows to the flesh ie to that which is works based even though he is zealous it counts for him nothing, squat, nada as a matter of fact it brings him DEATH.....but a man who sows to the Spirit ie that which is of Grace (proper knowledge of Gods way) then he reaps LIFE....you see he is zealous but understands grace, Gods way.....

So.........

: works of the law/flesh/carnal/human tradition/mans way = DEATH
and conversly: by faith/grace/Gods way/Spirit/heavenly = LIFE