Jesus said you need to be born again. If you confess with your mouth that Christ is Lord and that he paid our sin debt on the cross as a perfect sinnless sacrifice, and three days later rose from the dead and sent the Holy Spirit of God to help guide those who believe. I would say you are a Christian.
I myself believe in a literal interprtaion of the Creation as read in Genesis. Christ said also through one man, sin and death entered into the world. If Adam is that first man and there was death before him, through the gradual evolutionary process, then Jesus was lying. For a few years after I was born again I held onto my evolutionary beliefs. I thought God could have used it to bring man into the world, but as I read more and more and meditated on Gods word I felt a conviction to change my view on origins. Read the Bible and meditate on it ask the Holy Spirit to guide you. Heed what your heart tells you.
Just remember what my view or anyone elses view of origins is, it will always be debated on, and until we die or Christ comes and takes us to be with Him we will never know 100%. I think we all will be humbled before the Lord.
R.P.