The main issue here is that you’re basing your theology on how you feel, not on God’s divinely inspired Word -

Romans 1:18-23

For the wrath of God is revealed from heaven against all ungodliness and unrighteousness of men, who by their unrighteousness suppress the truth. For what can be known about God is plain to them, because God has shown it to them. For his invisible attributes, namely, his eternal power and divine nature, have been clearly perceived, ever since the creation of the world, in the things that have been made. So they are without excuse. For although they knew God, they did not honor him as God or give thanks to him, but they became futile in their thinking, and their foolish hearts were darkened. Claiming to be wise, they became fools, and exchanged the glory of the immortal God for images resembling mortal man and birds and animals and creeping things.

God reveals Himself to those who’ll truly believe.

Those that do not have the Word will be judged by the precepts of their own heart

And the precepts of everyone’s heart is sin- and the punishment for sin is death. It’s sin in general that condemns you to Hell, Jesus is there to save you from it.

On a personal note- I’ve had the same struggles and thoughts you have. I have grappled with knowing many I love won’t be saved. There are different theologies on hell- personally I believe it ranges from just separation from Heaven to actual torment depending on if those people were extremely evil or just nominally evil. Jesus speaks about different degrees of punishment, and illustrations of both darkness and fire are used. The way the Bible talks about other religions isn’t the same way you talk about them- Islam is barely a branch of Judaism or Christianity. Instead, it’s a faith based on a paedophile self-proclaimed prophet who was also a military leader and used his prophethood to marry nine women (against God’s law of only having one wife) one of which being a six year old child. Mormons follow a similar prophet. The Religious Jews that exist today are the ones who rejected Jesus’ message, like the ones in the old testament. Sure, both groups aren’t doomed per say as anytime they can be reached out to with the Gospel and many have been accepted. But Jesus did put a large emphasis on evangelism, His last command being

Matthew 28:19-20

Go therefore and make disciples of all nations, baptizing them inthe name of the Father and of the Son and of the Holy Spirit, teaching them to observe all that I have commanded you. And behold, I am with you always, to the end of the age.

So Jesus actively wants us to evangelise- evangelism is in fact the loving thing. If someone is wrong about something so critical, it is in fact hateful to not alert them to their wrongdoing because it is leading them away from salvation. Do you really want to be ascending when Christ comes back into heaven, and seeing your Muslim, Hindu and Atheist friends left behind? Will you say to them “sorry, I didn’t want to be hateful and force my religion on you?”