I grew up hearing that the real bible is written on the heart. And I think that is true as most of us have a conscience. But of course the bible is written by humans so it's fallible. Many Christians make it into a god itself. And that is idol worship. The bible is meant to be a general guide not a thing to replace your own heart.
It has lots of good in it but it also has caused great suffering as well which should act as an indicator of it's non divine status. If you have studied lots of religious as you say then you should see a common thread through all of them. And even the bible admits that the greatest commandment is love of god and others. And also against love there is no defense. And that God IS love. It then goes on to give a description of love 1 Corinthians 13:
"If I speak in the tongues of men and of angels, but have not love, I am only a ringing gong or a clanging cymbal. If I have the gift of prophecy and can fathom all mysteries and all knowledge, and if I have absolute faith so as to move mountains, but have not love, I am nothing. If I give all I possess to the poor and exult in the surrender of my body, but have not love, I gain nothing.
Love is patient, love is kind. It does not envy, it does not boast, it is not proud. It is not rude, it is not self-seeking, it is not easily angered, it keeps no account of wrongs. Love takes no pleasure in evil, but rejoices in the truth. It bears all things, believes all things, hopes all things, endures all things. Love never fails.
But where there are prophecies, they will cease; where there are tongues, they will be restrained; where there is knowledge, it will be dismissed. For we know in part and we prophesy in part, but when the perfect comes, the partial passes away.
When I was a child, I talked like a child, I thought like a child, I reasoned like a child. When I became a man, I set aside childish ways. Now we see but a dim reflection as in a mirror; then we shall see face to face. Now I know in part; then I shall know fully, even as I am fully known. And now these three remain: faith, hope, and love; but the greatest of these is love."
But you will have many Christian preach fear and hate and pride. None of these are love. In fact fear is:
"There is no fear in love, but perfect love casts out fear. For fear has to do with punishment, and whoever fears has not been perfected in love."
So all those people that cast their enemies into hell are not made perfect in love. And since god is love they are not made perfect in God.
You might also check out the Nag Hammadi scriptures which was another early branch of Christianity that was killed off by the early church so that all that has currently come down to us is literally church propaganda from a monopoly. And one should never trust an organization that has had over 1000 years of a monopoly which we call the dark ages.
Also books by Bart D. Ehrman are really good and he picks up a lot of stuff the biblical reader never even notices because the bible is frankly a lot to take in and fine details can get muddled.
Also finally check out people that have had near death experiences. An author by the name of Betty Eadie is a good one in her book Embraced by the Light. Just remember a lot of people will be liars and charlatans as well. They will try to scare you with demons and hell and various other monsters. But just keep the scriptures in this post in mind. Are these people acting in fear or love. Because again: "There is no fear in love, but perfect love casts out fear. For fear has to do with punishment, and whoever fears has not been perfected in love."