It seems like a reasonable question to ask. After all, would God not create a situation where everyone would worship Him properly? This might make sense to man but it doesn’t make sense to God. Therefore He explained to the first man the conditions for life in the garden and the penalty for transgressing these conditions, “for in the day that you eat of it you shall surely die” (Gen. 2:17). The option belonged to man whether to obey or not. Now it doesn’t take too much insight to know exactly how man responded. What is interesting is what happened next. They didn’t keel over and literally die. No, rather their eyes were opened and they knew they were naked (Gen. 3:7). But haven’t they been naked this entire time? Yes, but something changed within their perspective. It may have something to do with the spiritual death they experienced from transgressing God’s command coupled with the fact that their eyes were opened and being consciously aware of their sin. They were so aware that they attempted to cover their sin on their own by their own works.
From this act of rebellion unleashed an uninterrupted series of acts of rebellion that affect those of us today and even into the future. As the representative head of all humanity Adam’s transgression also affected all humanity leaving us with the same consequences as if we were the first to transgress (Romans 5:12). Paul describes our outcome without mincing any words: “18For the wrath of God is revealed from heaven against all ungodliness and unrighteousness of men, who by their unrighteousness suppress the truth. 19For what can be known about God is plain to them, because God has shown it to them. 20For his invisible attributes, namely, his eternal power and divine nature, have been clearly perceived, ever since the creation of the world, in the things that have been made. So they are without excuse. 21For although they knew God, they did not honor him as God or give thanks to him, but they became futile in their thinking, and their foolish hearts were darkened. 22Claiming to be wise, they became fools,” (Rom. 1:18-22).
This is the condition of the natural man as distinct from the “righteous” man or woman (Scripture speaks of humanity when it refers to man) who are considered righteous because of what Christ has done (Rom. 1:1-6). Paul explains that the natural man in his unrighteousness suppresses the truth that he or she has about God. Here Paul explains that the natural man has an understanding of God from the things that have been created or what we might call “natural revelation”. But rather than giving credit where credit is due the natural man opts to rebel and suppress the truth that she / he has about God. What is interesting about man (or woman) is that she or he is at all times a worshiper of something and appeals to a form of ultimate authority which is typically their object of worship. Now if the truth that they have about God is suppressed then where is their worship directed? What becomes their ultimate authority? If it isn’t the creator then by default it must the creature or the created things, the fig leaves of their own imagination if you will; “25because they exchanged the truth about God for a lie and worshiped and served the creature rather than the Creator, who is blessed forever! Amen” (Rom 1:25).
Why are there so many religions? This is the reason. People have suppressed the truth that they have about God in rebellion so that they can worship the gods of their choosing. Hope that helps.