Just watched the two videos, and Zakir Naik isn't saying that Allah is not God.
In the first video, he is arguing that the English word "God" is not a fair translation for Allah because in the English language the word "god" is played around with a lot. He is not saying that Allah is not God in concept. Rather, the word "God" itself is not as special as the word "Allah".
In the second video, he is arguing that if you can compare Allah and a human being to each other, then Allah can't be God but an inferior one.
In the first video, he is arguing that the English word "God" is not a fair translation for Allah because in the English language the word "god" is played around with a lot. He is not saying that Allah is not God in concept. Rather, the word "God" itself is not as special as the word "Allah".
In the second video, he is arguing that if you can compare Allah and a human being to each other, then Allah can't be God but an inferior one.