Hi arunangelo: I have often heard this comment before that God shows mankind unconditional love--meaning, no matter what you do, God will always love you. But if you have a careful look at several portions of the Bible throughout God's dealing with mankind, this does not seam to be supported by the Bible.
Jude 5, says: "Now I desire to remind you, though you know all things once for all, that the Lord, after saving a people out of the land of Egypt, subsequently destroyed those who did not believe." (NASB) Notice, although God did show love and save His people, but because they rejected Him, He then punished them by destroying them, a reoccurring theme throughout the scriptures.
Jesus said in Matthew 24:13: "But the one who endures to the end, he will be saved." (NASB) Clearly, this shows a person's final salvation is not determined at the moment that he begins to put faith in Jesus, but by the fact they stay faithful until death. So how can this represent unconditional love, if only faithful one's are saved?
Paul wrote in Philippians 2:12: "So then, my beloved, just as you have always obeyed, not as in my presence only, but now much more in my absence, work out your salvation with fear and trembling." (NASB) This was addressed to "the saints," (Philippians 1:1) Paul urged them not to be overly confident but to realize that their final salvation was not yet assured. Otherwise there would be no point saying this, especially if God showed unconditional love and it did not matter if they stayed faithful?
Paul said in Hebrews 10:26, 27: "For if we go on sinning willfully after receiving the knowledge of the truth, there no longer remains a sacrifice for sins, but a terrifying expectation of judgment and THE FURY OF A FIRE WHICH WILL CONSUME THE ADVERSARIES." (NASB) Because God does not show unconditional love, if a believer willfully practices sin and does not repent, they will lose their salvation.
Finally Paul also said in Hebrews 6:4-6: "For in the case of those who have once been enlightened and have tasted of the heavenly gift and have been made partakers of the Holy Spirit, and have tasted the good word of God and the powers of the age to come, and then have fallen away, it is impossible to renew them again to repentance, since they again crucify to themselves the Son of God and put Him to open shame." (NASB) Here Paul shows that even a person anointed with holy spirit can lose his hope of salvation, because God does not show unconditional love to people who turn their back on Him, rejecting Him, by not serving Him faithfully.