Why Christianity?

As an agnostic I’ve seen and listened to evidence of God and I have always believed there is some kind of higher power out there.

But my main issue is that when Christians publish arguments or debate an atheist they usually only end up proving the existence of a God, not THEIR God, so my main question is why is Christianity more valid/believable than say… Islam or Sikhism?.

Both of them had their messiahs that claimed to have spoken to god, both had their teachers and prophets, both are monotheistic and both focus deeply on good ethical conduct leading to an afterlife.

So what evidence or theological arguments makes Christianity more believable than a different religion with 1 god. Not trying to be argumentative btw just curious because Im searching for some truth

TLDR; Logically Why should I follow Christianity over a different religion, what makes yours more believable?