Is suicide a mortal sin that cannot be forgiven by God?

No, the Bible does not list suicide as an unforgivable sin. Even though taking one’s own life is a serious sin, God fully understands factors such as mental illness, extreme stress, or even genetic traits that may lead to suicidal urges. (Psalm 103:13, 14) Through the Bible, he provides comfort to those in distress. In addition, the Bible says that there will be “a resurrection of both the righteous and the unrighteous.” (Acts 24:15) This shows that there is hope of a resurrection for people who have made serious mistakes, such as having committed suicide.

God can forgive any sin, if the sinner sincerely repents of it. In the case of suicide, God certainly takes into account the mental/emotional state of the person, when judging them. But we have no way of knowing His final decision in any particular case.

Most people who commit suicide are suffering from major clinical depression, a very real illness which clouds judgment.  God doesn't punish us for being ill.

If you are thinking of suicide, why not give friendship a try.  There are plenty of loving and caring people in the world, and many would love to get to know you. 

Suicide has nothing to do with fairy tales. We can say people who commit suicide suffer and too, most of the ones who do that have depression. ( mustn't be confused with a simple depressed state).

Since God never said a damn thing about suicide in the Bible, no, it isn't.

It is if your scared of one of the 5,000 Gods 

ALWAYS REMEMBER WHAT CONSTITUTES A MORTAL SIN OR IT IS NOT A MORTAL SIN AT ALL.>>>>>>>

There are three conditions for a sin to me a mortal sin:

1) The object must constitute grave matter

2) Full knowledge that the act is sinful

3) Committed with deliberate consent of the will

THERE ARE VENIAL SINS TOO BUT THEY ARE NOT DEADLY SEE HERE>>.

https://www.ewtn.com/expert/answers/mortal_versus_venial.htm

If a person commits a Mortal Sin and has no way of going to confession before his death, he has only one chance of forgiveness: an Act of Perfect Contrition. But it must be said before death. If this is not made, he goes straight to Hell for all eternity.

IF A PERSON WHO SIMPLY HATES LIFE OR DOES NOT WANT TO PUT UP WITH ANY KIND OF SUFFERING KILLS HIMSELF, ITS A MORTAL DEADLY SIN, DO YOU TRULY THINK THEY ARE GOING TO HEAVEN? IF THAT WERE THE CASE WHY DOES NOT EVERYONE JUST KILL THEMSELVES AND SAVE THEMSELVES FROM THE AGGRAVATION AND INCONVENIENCES IN THIS VALLEY OF TEARS AND TELL GOD HERE I COME WHETHER YOU LIKE IT OR NOT. YOU WONT MAKE IT TO HEAVEN THATS FOR SURE. REMEMBER ALWAYS YOU CANNOT FOOL GOD, HE KNOWS YOUR EVERY THOUGHT BEFORE YOU EVEN THINK THEM >>>>>>>>>>>>

BUT ALSO SOMETIMES STRESS PLAYS TRICKS ON OUR MINDS AND WE MAY DO SOMETHING WE ORDINARILY WOULD NOT DO. GOD TAKES ALL THIS INTO CONSIDERATION ON JUDGMENT DAY, GOD'S LOVE AND MERCY IS SO GREAT HE WILL SCRUTINIZE EVERY MORSEL OF THOUGHT THAT WAS GOING THRU THEIR MIND BEFORE DEATH AND IF ONE THING IS MISSING THAT WOULD ORDINARILY CONSTITUTE A MORTAL SINS, YOU CAN BE SURE THAT THEY MAY JUST VERY WELL BE IN HEAVEN WITH JESUS(GOD). BUT REMEMBER, YOU CANNOT FOOL GOD, EVER. PLEASE READ THIS AND DONT GIVE UP PRAYING FOR THEM >>>>

THE ROMAN CATHOLIC CHURCH DOES NOT SAY ANYONE WHO COMMITS SUICIDE GOES TO HELL BUT
the CATHOLIC Church teaches is that anyone who commits a mortal sin and does not repent before death goes to hell. Mortal sin requires three conditions: grave matter, full knowledge of the gravity of the action, and full and free consent to the action. If any of those three conditions are missing, there is not mortal sin. All we can say for certain is that suicide constitutes grave matter. Given the fact that people who take their own lives often are very ill or under psychological stress, those factors can impede their knowledge and consent, making their actions tragic but not mortally sinful. Only someone who freely chooses to commit suicide with full knowledge of the gravity of the sinfulness would commit mortal sin by his suicide. Even then, between unconsciousness and final death, God might offer the person one final chance to repent, even if such an opportunity is not apparent to us

The Church says this about the eternal destiny of those who have taken their own lives: "We should not despair of the eternal salvation of persons who have taken their own lives. By ways known to him alone, God can provide the opportunity for salutary repentance. The Church prays for persons who have taken their own lives"! PLEASE SEE LINK TOO?

NOTE, VERY IMPORTANT>>>>>>>>>>>>>>>>>>>>

BECAUSE, IT IS THE ULTIMATE OF THINKING OF YOURSELF AND NOT OTHERS AS WITH FAMILY AND LOVED ONES AND MOST OF ALL JESUS(GOD INCARNATE)

DONT FORGET THIS EVER, WHEN YOU MAKE THE SIGN OF THE CROSS YOU FIRST START WITH AN UP AND DOWN MOVEMENT AS IF TO FORM AN ( i ) THEN YOU CROSS IT OUT BY THE FINISH OF THE SIGN OF THE CROSS FROM LEFT TO RIGHT. NOTICE HOW THE JESUS ON THE CROSS IS TELLING YOU TO FORGET YOURSELF AND MAKE GOD FIRST, THINK ABOUT IT.

https://www.catholiceducation.org/en/culture/catholic-contributions/the-sin-of-suicide.html

Ask him.

..............

There are several suicides in the bible and there is nothing about them going to hell (except for Judas Iscariot who was not going to hell because he hung himself).

Samuel 17:23 says: When Ahithophel saw that his advice had not been followed, he saddled his donkey and set out for his house in his hometown. He put his house in order and then hanged himself. So he died and was buried in his father's tomb. 

But the early church leaders decided that suicide is bad, and that they should discourage it by making it a mortal sin that cannot be forgiven, though they used to sell indulgences to the relatives that would let the suicide into heaven if the price was right.