So maybe God is not as opposed to suicide as all these religions are saying
Apart from the difficulties connected to asserting God's very existence, I think that the idea that religions universally condemn suicide is not completely accurate (I'm not saying you're saying this, I'm just making a general claim).
At least, they don't universally condemn it as an especially bad or egregious sin/wrongdoing meriting a special kind of punishment or eternal hell.
The basis for Jewish condemnation of suicide? Genesis 9:5: "and for your lifeblood I will require a reckoning". You need a special understanding of logic and fertile imagination to get from that statement to the idea that suicide is punished by eternal hellfire.
Christian condemnation? No explicit condemnation of suicide in the new testament.
Catholicism would have to wait hundreds of years until St augustine, a repressed theologian with sadistic tendencies (of the intellectual kind) to interpret the 'thou shalt not kill' commandment of the old testament as implicitly including suicide.
This was further elaborated by Aquinas in the middle ages: "(1) Suicide is contrary to natural self-love, whose aim is to preserve us. (2) Suicide injures the community of which an individual is a part. (3) Suicide violates our duty to God because God has given us life as a gift and in taking our lives we violate His right to determine the duration of our earthly existence. This conclusion was codified in the medieval doctrine that suicide nullified human beings' relationship to God, for our control over our body was limited to
usus (possession, employment) where God retained
dominium (dominion, authority). Law and popular practice in the Middle Ages sanctioned the desecration of the suicidal corpse, along with confiscation of the individual's property and denial of Christian burial." (stanford encyclopedia of philosophy).
This theological prohibition (but not Biblical) in christianity was compounded in the popular imagination by Dante's vision of suicides in the seventh level of hell, who exist there as trees and have to endure bleeding when cut and pruned (not great, but surely not the worst form of punishment either).
Islam? Things get pretty grim in the Hadiths (the sayings attributed to Muhammed, written by people many years after they had been passed down orally), where it is said that those who suicide suffer hellfire, though I won't go into the details here.
Hinduism? Says suicide produces karmic reactions, and so will not lead to enlightenment/liberation (but most actions won't either), and souls may linger on the earth.
Buddhism: Suicide will lead to reincarnation as it causes some negative karmic reactions and violates the prohibition against killing, though the quality of the rebirth ultimately depends on the intentions which led to the suicide (if someone suicides merely to get revenge on someone and to specifically cause suffering for another, this will have a worse outcome for their future existence than someone who suicides because they are being sent to some horrific concentration camp, or because they are tormented by a mental illness.)
So what we basically have is Judaism basing its condemnation of suicide on a dubious interpretation of vague pentateuch passages (and there isn't even a fully elaborated concept of eternal hell in Judaism), Christianity basing it on theological interpretations/inventions hundreds of years after the life of Jesus (who never even mentioned suicide), Islam founding it on written documents which resulted from hundreds of years of oral tradition (unreliable), Hinduism saying it has vague negative karmic consequences and could lead to souls roaming the earth (certainly nothing as bad as eternal hell), and Buddhism following on quite closely from Hinduism in emphasizing the negative karma produced (which varies according to intent and reasons).
None of this comes anywhere near close to constituting convergent evidence in the world religions that 1) there is actually a God 2) there is a hell 3) there is a God whose nature compels it to send suicided souls to that hell.
Though it is evidence that humans throughout history have invented and imagined a whole lot of theological and eschatological concepts aimed at compelling or coercing people to believe in whatever religion they are promulgating and being apologists for.
