If there classes include sessions on backbiting and discrediting Daees and scholars, don’t attend.

I joined in a sisters only online class on The Names of Allaah. Later I found out that they claim that we are all salafis and we should not listen to Dr Zakir naik’s lectures as he does bidah, but as far as I know Dr Zakir Naik gives Da’wah in the way of the Quran and Sunnah. can I attend their classes as I don’t know what they are saying is correct or wrong ?

Knowledge & Propagation | October 24, 2015 3:33 am
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I went to visit my brother and his family. In their local masjid some brothers get together to gain some islamic knowledge everyday after Isha. they use to read some books 1. Hayatus sahaba 2. Muntakhab ahadith by Hazrat maulana Muhammad Yousuf Kandhlavi. I would like to know whether these books are authentic? Please advise.
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Do all the books of ibn Kathir include information from Christian and Jewish sources like “Qasas ul Anbiya”? I want to read “Ghazwat ul Rasul”, “Al-Sira Al-Nabawiyya”, and “Al Bidayah Wa Al Nihayah”. All these are by ibn Kathir. But it is confusing to me if there are citations other than Quran and Sunnah. Please advice.