I just graduated from a Southern Baptist Seminary, and I can assure you that you MUST be born again, in a SBC church.
The biggest difference between Pentecostal/Charismatic or non-denominational churches is the issue of speaking in tongues and the charismatic gifts.
The SBC is undergoing a lot of issues. I do not actually go to a SB church anymore, but because of the pastor, not the denomination. That being said, having studied Baptist history and church history, I do believe the convention is off course. But because it is ONLY a convention, a loose affiliation of local churches, there is nothing they can do to excommunicate or pronounce you unsaved!
I would ask this person if they believe they are born again. If they are not, either they have not been listening in church, or they are in a church that has gone astray.
The gospel of Jesus is the truth of Jesus dying on the cross for our sins and rising from the dead in any church. We believe and repent and are saved. I would also suggest going to a SBC church with this person, and see what you think.
That might be the start of some dialogue for both of you. And here is a link for you to read:
The Baptist Faith & Message
"
IV. Salvation
Salvation involves the redemption of the whole man, and is offered freely to all who accept Jesus Christ as Lord and Saviour, who by His own blood obtained eternal redemption for the believer. In its broadest sense salvation includes regeneration, justification, sanctification, and glorification. There is no salvation apart from personal faith in Jesus Christ as Lord.
A. Regeneration, or the new birth, is a work of God's grace whereby believers become new creatures in Christ Jesus. It is a change of heart wrought by the Holy Spirit through conviction of sin, to which the sinner responds in repentance toward God and faith in the Lord Jesus Christ. Repentance and faith are inseparable experiences of grace.
Repentance is a genuine turning from sin toward God. Faith is the acceptance of Jesus Christ and commitment of the entire personality to Him as Lord and Saviour."
There are a wide range of soteriological beliefs but these are more or less the core beliefs. I hope that answers some of your questions.