what time? Persia had longstanding zorastrian religious roots until the islamic conquest and the non persian middle east was mostly eastern christian though of non orthodox sects (mia/monopysites for instance) as any history of byzantine empire would be forced to relate.

Also sol invictus was big in the east before christianity came about while arabia combined mostly jewish and pagan religious histories.

i really think you need to narrow down your question or timeframe

Iran was largely Zoroastrian, especially by the Sasanian period, when it was declared the state religion at one point. Prior to that, there were pockets of Christianity in western Iran and Buddhism in eastern Iran.

Here you go, one of the top voted questions on Islam

In short, the vast majority were polytheists with some Christian and even less Jewish presence.