Hitler considered Black people together with Jews as the lowest race. But he never started a genocide against Black people, he only prohibited race-mixing and interracial marriages and he also sterilized all ( about 500 ) children born of a mixed relationship.
Regarding Muslims, we first of all have to distinguish between the religion and the people who practice it. He considered Arabs to be inferior, but not as low as Blacks or Jews, but he greatly admired Islam and made several comments such as :
“The Mohammedan religion would have been much more compatible to us than Christianity. Why did it have to be Christianity with its meekness and flabbiness?”
“Had Charles Martel not been victorious at Poitiers, then we should in all probability have been converted to Mohammedanism, that cult which glorifies the heroism and which opens up the seventh Heaven to the bold warrior alone. Then the Germanic races would have conquered the world.”
“A religion that believed in spreading the faith by the sword and in subjugating all nations to that faith. Such a creed was perfectly suited to the German temperament.”
“The peoples of Islam will always be closer to us than, for example, France”
Overall, Hitler considered Islam to be a great religion and regretted that past Muslim Empires did not conquer and convert Germany, however he disliked Arabs.