Pick and choose Christianity? You mean pick from some parts of the scripture and not others? That's not following the Lord, that's following self.
Jesus said "Whoever wants to be my disciple must deny themselves and take up their cross daily and follow me" (Luke 9:23). The Christian must deny their own way and follow Christ and His word. It is not pick and choose.
Nevertheless, that is what Christians do. They say they don't, but they do. I don't know anyone who has given away all their wealth to follow Jesus.