Is Lord Krishna God? As he is not begotten human being and as Dr. Zakir Naik says God neither begets nor he is begotten

Dr. Naik is a leader and teacher in Islam, not Hinduism, They have totally different beliefs. So his beliefs has no bearing on this.

In Hinduism they believe in reincarnation.

Krishna is usually regarded as the eight incarnation of lord Vishnu. So he is considered a deity in the Hindu religion.