Is Allah the Disbelievers' Lord?

In S 2:21 we read: People, worship your lord, the one who created you and those before you; perhaps you will fear.

People in general supposedly have Allah as their lord.

S 2:62 Those who have believed and those who were Jewish and the Nasara and the Sabians--those who have believed in Allah and the last day and have done a righteous deed, theirs is their wage with their lord and there is no fear upon them nor do they grieve.

Jews, 'Nasara' and the pagan Sabians supposedly have Allah as their lord.

The Quran in one or two passages speaks of Allah as a mawla. What does it mean? Wiktionary defines it thus:

1. chief; lord; master

2. patron; client

3. slave

4. ally; friend; follower مولى - Wiktionary

Might Allah be a client? A slave? A follower?

S 47:11 That is because Allah is a mawla of those who have believed and that the kafirun have no mawla.

Muslims will say that Allah is our lord; but the verse above says that the disbelievers have no mawla, they have no lord. So how could Allah be our lord?