I had to laugh.
For non-Christians and new Christians, the TULIP in tulipgirl has nothing to do with flowers but everything to do with the five points of Calvinism:
Total Depravity. Sin has affected all parts of man. The heart, emotions, will, mind, and body are all affected by sin. We are completely sinful.
Unconditional Election. God does not base His election on anything He sees in the individual.
Limited Atonement. Jesus died only for the elect. Though Jesus’ sacrifice was sufficient for all, it was not efficacious for all.
Irresistible Grace. When God calls his elect into salvation, they cannot resist. God offers to all people the gospel message. This is called the external call. But to the elect, God extends an internal call and it cannot be resisted.
Perseverance of the Saints. You cannot lose your salvation. Because the Father has elected, the Son has redeemed, and the Holy Spirit has applied salvation, those thus saved are eternally secure. They are eternally secure in Christ.
I think its important for Christians to understand Calvinism, what makes it distinctive within the Christian movement, even if they don't tiptoe through the tulips that often.