Unfortunately just believing in Christ does not make one a Saint. It takes a lot more than that. I believe in Christ but I am not a saint. I am a sinner like we all are.
Saints are sinners, too.
26In the same way the Spirit also helps our weakness; for we do not know how to pray as we should, but the Spirit Himself intercedes for us with groanings too deep for words; 27and He who searches the hearts knows what the mind of the Spirit is, because He intercedes for the saints according to the will of God. Romans 8:26-27
Paul sees it a different way than you.