Christianity... And here is why:
Ladies and gentlemen, I am a sinner. I am the vilest person that you can come across. Even my thoughts are tainted by sin. I have thought adulterous and hateful thoughts, I have been proud, I have been pious, I have rejected what is good. I can become angry, I have lusted, I have stolen, etc etc etc. really guys, I am a bad...not just bad, but vile person.
Do you know what that means? That means that I have disobeyed our creator: God. I have lived a life of active rebellion against Him, seeking to rid myself of Him and usurp His place as sovereign God...essentially. This means, folks, that I deserve death. I deserve to burn in Hell, to live separated from God for all eternity: suffering eternal torment.
I could do nothing to pay this off. My good works are not enough to pay that debt off. The payment...is...death. I cannot be good enough.
But God sent His son to die on the cross...God became flesh, and died on the cross...in my place...so that I may not have to suffer His wrath, so that I may have eternal life, and so that furthermore, I can worship, serve, and bring glory to our God. Christ died and rose again...so that I may not get what I deserve: which is death in Hell.
I trust in Christ alone for my salvation from sin, and because Christ has died for me, I am more than happy to live for and serve him.
No religion can compare to that. All religions tell you you must be a good person to earn your salvation. But they realize not that they cannot be good enough because we by nature are not good and the payment is death...not a life of goodness. FURTHER, even our good works are tainted by sinful reasons.
There is no life in anything but Christ...and so I would urge people to Repent and put their faith in Christ alone for salvation...
Anyways, that's why. Because I have no hope in anything else but Christ.
EDIT: for denomination, I would say I am a Reformed Baptist. The reason this is is because I am a Calvinist who holds to believers baptism really. It mainly just shows what I hold in regards to non-essential doctrines. But the main importance is that I am a Christian.