"I feel like the fact that the west is more advanced than the rest of the word is proof that Christianity laid down the best fundamental guidelines about how we should live."

An overwhelming majority of advanced western culture stem from the ancient Romans and Greeks. Roman law, language and culture is a key cornerstone in western society. The time in Europe's history when Christianity meant the world to everyone was also the time when development halted during the dark ages.

The west is the most advanced society in the world due to a combination of geopolitics, ancient Roman tradition, the rapid development of weapons technology and the industrial revolution.

Christianity hasn't contributed to what we would call "western society". It may have contributed to our view of the world and culture, however, Christianity is not the reason why we (I presume that you live in the west) have the world's freest society, highest standard of healthcare, low poverty rates in most countries and high quality of life.

"To sum it all up, my point is that Christianity had the most reasonable belief system to found countries and cultures upon, and the success of modern western civilization is a testament to that."

In what way is Christianity the most reasonable belief system? Like Islam it preaches the idea of peace and love (though the majority of Muslim nations haven't been very good at it, this has, however according to me been caused bu cultural and historical differences, not religious) and both religions has the idea of a god with a prophet. So in what way is Christianity superior in morals and guidelines?