He's only a creationist in the sense that he believes a deity created the universe with foreknowledge of what would happen. He wrote a book on evolution and calls people - like yourself - who don't believe in evolution "uneducated." His words. I agree with him on that point.
But I disagree on the others. His belief is an inference. It's not supportable by evidence, but by personal experience interpreted through culture.
For one thing, if you assume that the Christian god created the universe, you have to explain:
1. why that god and not some other one?
2. how is God moral when He Created an evolutionary process that produced parasites that cause immense suffering among human children?
Collins didn't answer those questions. He's not capable of answering those questions - but you're welcome to give it a go.
The whole driving force behind existence is way too competitive and the history of Earths organisms and evolutionary path
of predation and right down to the nature of sexual reproduction
screams there was nothing intelligent in the design , or that if there were a creator it was one who relished in the suffering of the creation. I think this so much that if there truly were a creator , it is one of such twisted and awful nature that you could only call this thing a monster.
The struggling history of all living creatures and the devastation's of cosmic , volcanic and atmospheric origin
show the plight of all animal life on Earth to be unguided unaided and entirely resting in a uncertain gamble and resting in the throw of the dice.
For this reason I cannot accept there could be an intelligent designer , and if there was it was what creationists would call evil, and must have met it's own demise. But for all intents and purpose a thing of such terrible nature could not be hidden so well, and indeed would manifest itself within it's creation and all would know the terrible nature and wrath of the monster.
But it simply isn't there to be found , therefore it simply cannot exist.