A Question for Creation Science Advocates

I have a couple of questions for Christians who are advocates of creation science:

• Assume a person said he read and believed the gospels of Matthew, Mark, Luke and John. Would you say that person was saved?
• What if the person then said that he didn't believe Genesis though? Would you say the person was still saved?
  
• Would you insist that they believe every word of Genesis as well in order to be saved?
• Is it possible such insistence would be a needless deterrent to belief in the Gospel?
  

The devil is in the details. The details of Genesis water down the grace and beauty of the gospel.