Few of the callers today call to tawhid (the oneness of Allah); is the one who does not call to tawhid to be warned against?

Question:
He says: Honorable Shaykh, may Allah grant you success. The callers have increased in our time, but few of them call to tawhid (the oneness of Allah) and 'aqidah (creed). Is the one who does not call to tawhid considered to be opposing the Messengers, such that one should be warned against his call?

Answer:
Yes, one should be warned against the one who does not call to tawhid. He says what is not a necessary consequence of tawhid, and he warns against sins and disobedience, riba (usury or interest), zina (unlawful sexual intercourse), and the like. This is a call that has no head, like a body that has no head. Can a body without a head be alive? No, it is dead. This is a dead call, and there is no benefit behind it. This is a contradiction of the call of the Messengers (peace and blessings be upon them), for they first began with tawhid. Once tawhid was established and realized, they taught the people the matters of their religion.
If the first thing you call them to is the testimony that there is no god but Allah, and if they respond to that, then inform them that Allah has made obligatory upon them five prayers in the day. If they respond to that...
As for what they respond to, there is no benefit. Even if they prayed night and day, there would be no benefit. Every call that does not focus on tawhid is a dead call and produces nothing, ever.