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I.e., "we failed notwithstanding our status as descendants of Abraham, and despite all our ability and learning".
As the sequence shows (and as has been pointed out in note [17] on 15:18 , this relates to all attempts at predicting the future by means of astrology or esoteric calculations, or at influencing the course of future events by means of "occult sciences".
What is the force of "now"? It refers to the early Makkan period of Revelation. It means that whatever excuse there may have been before, for people to try to seek out the hidden truths of the Unseen World through jinns, there was none now, as the perspicuous Qur-an had restored the Message of Unity and cleared religion of all the cobwebs, mysteries, and falsehoods with which priestcraft and pious fraud had overlaid it. The result is that such seekers after false hidden knowledge will find themselves confronted now by the flaming fire, which, like the shafts of meteoric light (see note), will lie in wait for and nip such priestcraft and black magic in the bud.