They aren't "Christian laws". They are the laws of the land. The laws were voted on by all the people. Sharia Law has not been voted on by anyone, yet courts have used it. That is wrong.
Yes, I am concerned about keeping Sharia Law out because it is unconstitutional to have religious law in our system. You're not getting it. You call our laws voted on by the people "Christian laws". That is dishonest. The church didn't INSTILL the law, the people did. When Sharia Law is used then you will have Islamist Clerics testifying in courts of law what the law means. Do you understand that? Instead of a judge ruling by the law voted on by the people, we will have people's fate being decided on by Islamic clerics. That cannot be allowed in the USA.