We are all fallen. That is why so many people interpret the Bible differently. But there is one truth, one correct interpretation. I am sure no one knows it all on this earth. But there are fundamental things that Christians believe that you don't seem to believe. I think that is why some tell you that. I don't think any real Christian would tell you that just to "get you" or be mean.
Some of your questions are already answered in the Bible. I would suggest to study it more, more importantly believe it. And most importantly, live it.
If you truly believe you will repent. We show God we love Him by doing His will and following His commands. You can tell true believers and non believers by their "fruits".
Matthew 7:16-20 KJV
Ye shall know them by their fruits. Do men gather grapes of thorns, or figs of thistles? Even so every good tree bringeth forth good fruit; but a corrupt tree bringeth forth evil fruit. A good tree cannot bring forth evil fruit, neither can a corrupt tree bring forth good fruit. Every tree that bringeth not forth good fruit is hewn down, and cast into the fire. Wherefore by their fruits ye shall know them.
John 3:18
Whoever believes in Him is not condemned, but whoever does not believe has already been condemned, because he has not believed in the name of God's one and only Son.
John 3:36
Whoever believes in the Son has eternal life. Whoever rejects the Son will not see life. Instead, the wrath of God remains on him."
Acts 2:38
Peter replied, "Repent and be baptized, every one of you, in the name of Jesus Christ for the forgiveness of your sins, and you will receive the gift of the Holy Spirit.
Acts 16:31
They replied, "Believe in the Lord Jesus and you will be saved, you and your household."