There's a difference between ascribing creation to "a God" and Christianity. Christianity in this modern era just doesn't have a leg to stand on. There is just SO much in the Bible that has been proven to be untrue. So if you believe the Bible is the true inspired word of God, literally God breathed (Ephesians 3:20), then there are some problems.

I have ZERO problem with people who want to believe The Bible as a personal belief system. However, when you want to mandate how my children are taught, or limit their exposure to scientific teaching because of your false religion; then I have an issue.

On the other hand, I will take up arms to defend your right to worship. Problem is, the other side doesn't really much reciprocate.