Syed Ali Alhabshee has accused DAP of being successful in ruining the unity among Malays and Muslims through the propagation of a "racist" political doctrine.
The Cheras Umno division leader said DAP is aided by a handful of "opportunistic" Malays, who are "willing to sell the dignity of their race and religion" for personal agenda.
Syed Ali said DAP is aware that the first step in dividing the Malays is the "destruction" of Islam's strength.
"I see DAP has succeeded in offering 'sweeteners' to the Malays, until some of them are willing to become members of DAP to struggle with the racist party.
"There are certain quarters who are even willing to form a new party to follow the pointers of DAP," he added, in reference to the split in PAS.
The division leader said Malays who joined DAP can no longer claim to be struggling for the community or Islam.
"They cannot say they joined DAP for the interest of the Malays and Islam because DAP is a secular party and racist.
"That is the difference with the Umno struggle. True, we base (the struggle) on national spirit but it also upholds Islamic tenets," he added.
Citing fractured ties, Syed Ali conceded that Malays and Muslims in this country no longer possess the strength to confront their foes.
"Sometimes, we cannot work together because of little things, and this opportunity is seized by our enemies to weaken us, especially Umno.
"If we cannot solve the small problems, what will happen to Muslims in future? We will be destroyed," he added.
Therefore, Syed Ali urged all Umno members to unite once again.
"Umno members, Malays, and Muslims are brothers. Let us pool our strengths to face the enemies of Islam who are becoming more evident of late," he said.