Rom 5:1-3
Eph 2:8-9
Rom 8:38-39
1 Jn 5:11-12
2 Cor 5:21
Once saved with eternal life, you are eternally saved. There is nothing that will separate you from the love of God. Suggesting any sin will separate us denies the faith of Christ and is blasphemous.
Suggesting that no sin can "un-save" you is blasphemous.
You can be so-called "saved", slip off the path of righteousness, commit a murder, not ask God for forgiveness, and end up in hell. If you do not believe this, then you have little grounding in theology.
Now, if you ask for forgiveness and are truly sorry in your heart, God will forgive you and bring you back to him.