I'm not sure what you mean by the "short way to the foundation that is built".
I agree that we are saved to begin a new life in Christ. But the way you and some others make it sound like we can't ever fall away and that DOES lead some to live a life of sin. It's plainly stated by some.
Also, falling away DOES mean you become lost,,,what you're speaking about above might be sin. If we sin we ask forgiveness and continue on...If we fall away to the faith, we become lost. Fall away means to leave, abandon, the faith we have.
1 Timothy 4:1
Now the Spirit expressly says that in later times some will depart from the faith by devoting themselves to deceitful spirits and teachings of demons,
Hebrews 6:4-6
For it is impossible, in the case of those who have once been enlightened, who have tasted the heavenly gift, and have shared in the Holy Spirit, and have tasted the goodness of the word of God and the powers of the age to come, and then have fallen away, to restore them again to repentance, since they are crucifying once again the Son of God to their own harm and holding him up to contempt.
Hebrews 3:12
Take care, brothers, lest there be in any of you an evil, unbelieving heart, leading you to fall away from the living God.
Revelation 2:4-5
But I have this against you, that you have abandoned the love you had at first. Remember therefore from where you have fallen; repent, and do the works you did at first. If not, I will come to you and remove your lampstand from its place, unless you repent.
2 Corinthians 11:3
But I am afraid that as the serpent deceived Eve by his cunning, your thoughts will be led astray from a sincere and pure devotion to Christ.
Romans 11:19-22
Then you will say, “Branches were broken off so that I might be grafted in.” That is true. They were broken off because of their unbelief, but you stand fast through faith. So do not become proud, but fear. For if God did not spare the natural branches, neither will he spare you. Note then the kindness and the severity of God: severity toward those who have fallen, but God's kindness to you, provided you continue in his kindness. Otherwise you too will be cut off.
James 5:19-20
My brothers, if anyone among you wanders from the truth and someone brings him back, let him know that whoever brings back a sinner from his wandering will save his soul from death and will cover a multitude of sins.
and many more....
It's clear from scripture that we CAN fall away and become lost.
God always kept a remnant in Israel,,,but not ALL of Israel was saved...only those that had faith in God and obeyed Him. Blessings to those that obeyed,,,curses to those that did not. God has always required obedience.
Also, as to trial by fire I believe you're referring to
1 Corinthians 3:1-15
If you read it carefully, you'll find that it is not speaking about US going through fire, but the Apostles, in the case Paul and Apollos, but all those who taught were required to teach correctly the foundation of Christ...if they did not teach correctly THEY would be tested as through fire.
Yes, it all made sense and I replied, however I don't understand your very last paragraph. You seem to be agreeing that some DO fall away into the wilderness....