"What about these scientists who believe in creation;are their credentials still not good enough ?"
I tried to explain that I follow evidence first and foremost. Credentials are useful in establishing credibility but are not a guarantee of authenticity. In any case the vast majority of biologists go along with evolution rather than a form of a creationist idea.
"Ofc, some believe, some don't."
I don't care what they believe - I'm interested in evidence.
"Q: Do you only agree with those who agree with your belief system?"
If I have a "belief system" on the topic under discussion it is this: there are very few things that I'm certain about. I might be extremely confident about some things but hardly ever certain. I try to go were the evidence takes me and would like to think that I will change my mind if the evidence warrants this for something that I'm currently confident about.