He has that right to say whatever he wants. The Chiefs also have the right to release him as he's representing their brand poorly. I'm sure Mahomes is pumped about having answer questions about Butker for the next 6 months. But freedom of speech/expression is NOT freedom from consequences.
And if this wasn't hate speech, it was very very close. It was quite frankly disgusting as hell. There was nothing "religious" about his speech, it was a speech designed to generate controversy and designed to "teach the women, queers, and minorities their place".
Particularly ironic considering the new story going around. And really not all that surprising. Since this has gone viral quite a few of his old college classmates have started speaking up. Apparently Butker did quite alot of "experimenting" with other men in college. Now I don't really care if Butker is gay or not (his wife might though!). But when his self-loathing turns into him trying to encourage harm to LGBTQ+ people and trying suppress women it becomes everyone's problem. At least everyone with a moral center shouldn't want to platform or listen to that nonsense.