That's odd. My iguana never liked taking baths at first, but he never fought with me. I mean, he'd run to one end and then the next and jump out but I'd just put him right back and he'd eventually give up and just look at me like ;[...

Now he likes them, though. Today, he laid his head down underwater for the first time. He just kinda looked at me and started drinking and then popped back up. I recommend cupping your hand full of water and letting it run from your hand onto their back, and maybe to ontop of their head if it lets you without getting irritated. That always calms mine down.