Save, saved, salvation, are words in the scriptures that are misquoted according to the context. According to Greek interpretation save=deliver, saved=delivered, salvation=deliverance.
We are instructed in the scriptures to not try to determine who the elect are. God's called elders are to preach to the visible church, and God draws and adds to the church daily such as should be "saved" ("delivered" as they sojourn here in this world from believing a false doctrine). Acts 2:44-47.
All of those, of God's elect, that are preaching and believing in false doctrines have their eternal salvation (deliverance) secured by Christ's death on the cross.
The two gates depicted in Matt 7 harmonizes with these truths. The straight gate represents the visible church that is preaching the truths of Christ's doctrine, and are enjoying that good and abundant "life" as they live here on earth. ("life" in this scripture does not reference "eternal life")
The wide gate are those who are preaching a false doctrine, and suffer destructions because of it, but still have their eternal inheritance.