“…and nor (the path of) those who went astray.”
(Surah Faatihah, 7)
“Those who went astray” are the Nasaara. The trait of deviation was overwhelming in them. The reason for this is that on account of their love for this worldly life they were neglectful and indifferent [towards Deen]. Thus, their trait of being astray is expressed here, although in the Aakhirat they, too, will be the target of Allah’s wrath.