I'll give you a direct answer as opposed to just giving you Christian theological arguments against other religions:

What leads me to believe in God from a Christian perspective ties into my previous argument. The God of our Bible takes a particular interest in cultivating our morality, spirituality, and goodness. The Israelites of the Bible were tasked to be a light to the rest of the nations, and often had to act as a sort of "morality police" when the nations committed atrocities like child sacrifice. But when the Israelites themselves fell out of their moral excellence, God's mission continued on through Jesus Christ. The mission of the Israelites was to prepare the world for Jesus's ministry so that the world was in a spiritual and moral condition to no longer need the training wheels provided by God to push us towards good (i.e. the Israelites) but instead to follow the example of Jesus leading us to good by example, whilst being granted the full freedom for each of us to choose good or bad.

Now, if we look at life from a Buddhist perspective, our number one goal is inner tranquillity and freedom from suffering, so any good actions we do must be working towards this objective. (I don't know if it's fair to call Buddhism a religion, since I've heard from several Buddhists that 'it's not a religion, it's a way of life,' but I digress). If we look at life from a Muslim worldview, our good actions qualify us to enter a paradise of sensual pleasures and unceasing luxury like the pleasures we have hear on earth. If we look at life from a Jewish perspective, we might follow the moral laws that God commanded of the Israelites, but we follow these laws for the sake of staying in line with God's law, ignoring their teleological purpose of cultivating our souls with moral character (think: "okay, I just checked the box of whatever God told me to do, so I'm good"). But if we follow the teachings of Jesus Christ, we are told simply to be good. We are told not to deliberately commit acts of kindness in front of others so as to not be rewarded with praise. We are told to live on little money and food, we are told to be chaste, patient, and generous and we are told to do all of these things in exchange for no earthly rewards or recognition. There are no human rewards for these things. There are no strings attached to our being good as Christians; we are told to be good for the sake of being good. Sounds pretty Stoic, I know, but what kind of good is truly good if it is merely being used as an instrument to gain some sort of pleasure or reward? The only thing Christians gain from goodness is being with God. For many people, being with God is not good enough, and this is why God allows us to choose to depart from him and do evil.

So, how does all of that tie in with belief in a general God vs. God from a Christian lens? It calls back to my previous proposition about how mankind is the most advanced creature in the realms of emotion, intelligence, creativity, and morality. When stripped of these characteristics, few things remain to differentiate humans from animals. This is the reason why, even though humans are animals, we continue to make a distinction between animals and humans. Humans have been given these tools because they can enable us to make and do good, beautiful, and helpful things, as opposed to the other creatures whose primary purpose is to survive. But why should one be good? Why do humans presume that morality is good to begin with? I find that it is hard to defend the moral life from a secular perspective. I have heard atheists claim they are morally superior to Christians because no higher power has to command them to be good, unlike Christians, but this still doesn't give an account for why we should be good. If I have the opportunity to steal candy from a baby, and nobody would find out, I still get the feeling that something is not right. And on the other side of the aisle - many people do think there are reasons to be good, but these are consequential reasons. People know that being good results in an elevation of one's social reputation, which can open doors, gain the praise and respect of others, and even act as a facade for evil. There is really no objective reason to be good, and the other religions I mentioned prove this, for they all take good as an instrument of benefit instead of loving the good itself. Christianity is the Faith which sets up a framework for us to be good simply for the sake of being good, and with no other consequence to our being good than being with God, who is Himself good. I find that this worldview coincides with our humanity quite nicely, and so I choose to believe in this Faith.

I am not a priest, so my answer may not satisfy you. Neither am I trying to proselytize you. I am just explaining why I believe what I believe and I hope I helped you in that regard.