This is terribly OT for a Great Debate topic, but what the hell?
Anyone who says that Christians can't be objective scientists doesn't know what science is.
Nobody that I'm aware of says Christians can't do science. Persons of all faiths or none are welcome in the scientific brother/sisterhood.
But like all scientists, they must cling to scientific methodologies. That stipulates:
1) that theories be falsifiable
2) that all relevant evidence be considered
3) that findings be submitted to peer review
among other things.
Creationists, on the other hand, promote "theories" that are universally
unfalsifiable, reject evidence that conflicts with their
a priori conclusion (that the Bible is inerrant), and never submit to the peer review process.
Christians can be scientists, but creationists aren't scientists because creationism isn't science, it's dogma.
Many of the great scientists were either Christians or came to the conclusion that God must exist
And those very same scientists, to a man, rejected the idea that the Bible was inerrant and literally true. Why do you suppose that was?