In short, nothing compares.
Given that, by your own description, it's entirely subjective, how do you know if it compares?
I know of devout Muslims and people of other faiths, but they do not experience the real presence of God which I share with many other Christians, and the inner peace and joy we get by knowing God through personal experience.
You don't 'know' that, you believe that as an article of faith. You can't 'know' it, because you have no method by which you can compare. They, I'm sure, would say exactly the same about their sense of Allah, or whatever divinity they believe in.
That, to me, is at best an indication that you are all interacting with the same 'something', but that your personal beliefs are shading your interpretation of it.
Then there are the profound answers to prayer which can't be explained away by mere coincidence or selection bias.
If there were any of those, of course, but so far as I know there aren't.
I have no need to explore other religions and belief systems because I have found God and there is nothing in this world that can ever take away God's love.
You have found a sense of God, and that brings you happiness and contentment, and you have no motivation to look for anything more, and that's fine: I question whether you can claim that you 'know' this is any sort of god, and particularly that you can 'know' that it's the Christian God.
O.