Can I believe in 2 different religions?

Paul admonished: “I exhort you, brothers, through the name of our Lord Jesus Christ that you should all speak in agreement, and that there should not be divisions among you, but that you may be fitly united in the same mind and in the same line of thought.”—1 Corinthians 1:10.
Of course, unity of belief cannot be achieved by coercion. It is achieved only when individuals carefully investigate matters and arrive at and accept the same conclusions. Thus, a personal study of God’s Word and an honest desire to apply what is learned are essential steps to enjoy the kind of unity that Paul spoke of. To Learn more go to the website www.jw.org and click on request a free home bible study.

Buddhist teachers will say that, yes, you can believe in Buddhism and Christianity. Unfortunately, Christian teachers would say you can not also believe in Buddhism, because to do so is a sin.

Your friends are wrong when they say that if you can not decide to believe to any religion you are going to lost. First of all, you do have a religion - Buddhism - and an honourable one. Second, in many (if not most) Western countries outside the United States, no more than half the population still believes in the Christian religion. In other words, it is no longer possible to say that only Christians have the truth. Even if eventually you have no religion, you can still have a fulfilling life.

If Christians believe in a God who provides no evidence of his existence but then punishes you for not really believing in his existence, that is their choice.

Their are 1200 different religions in the US alone. You are saying that you would like to be 2 of those religions. Now Buddhism and Christianity are two completely different religions and beliefs. This interesting Compared to the human complexities tacked onto the Jewish faith, Jesus’ teachings were marked by simplicity. Paul, one of Christianity’s most energetic first-century missionaries, showed this when he spoke of Christianity’s main qualities: “There remain faith, hope, love, these three; but the greatest of these is love.” (1 Corinthians 13:13) Other religions speak of “faith, hope, and love” too, and yet Christianity is different. How?
Jesus emphasized the need to “exercise faith in God,” the One he described as the Creator. (John 14:1; Matthew 19:4; Mark 13:19) So Christianity differs from Jainism and Buddhism, both of which reject the idea of a Creator, claiming that the universe has always existed. And since Christ spoke about “the only true God,” he clearly did not believe in a multitude of true gods and goddesses as the religions of ancient Babylon, Egypt, Greece, and Rome taught, or as Hinduism still teaches.
The divine purpose, Jesus explained, was that he give ‘his soul as a ransom in exchange for many,’ to “save what was lost,” so that “everyone exercising faith in him might not be destroyed but have everlasting life. (Luke 19:10) For the Son of man came to seek and to save what was lost.” Jesus taught that there is just one true faith. He advised: “Go in through the narrow gate; because broad and spacious is the road leading off into destruction, and many are the ones going in through it; whereas narrow is the gate and cramped the road leading off into life, and few are the ones finding it.
(Matthew 7:13, 14) Go in through the narrow gate, because broad is the gate and spacious is the road leading off into destruction, and many are going in through it; 14 whereas narrow is the gate and cramped the road leading off into life, and few are finding it. Christian hope is centered in the Creator’s promise that his government will solve world problems. So from the start of Jesus’ ministry in 29 C.E., he encouraged people to “have faith in the good news” that “the kingdom of God has drawn near.” (Mark 1:15) Unlike Eastern religions, such as Ch’ŏndogyo, Jesus’ teaching did not stress nationalism as a way of realizing the Christian hope. In fact, Jesus rejected all suggestions that he enter politics. (Matthew 4:8-10) Again the Devil took him along to an unusually high mountain and showed him all the kingdoms of the world and their glory. 9 And he said to him: “All these things I will give you if you fall down and do an act of worship to me.” 10 Then Jesus said to him: “Go away, Satan! For it is written: ‘It is Jehovah your God you must worship, and it is to him alone you must render sacred service.
I would also suggest that you go to jw.org.

Of course we can believe in 2 different religions but the challenge is how to balance our beliefs? One religion may say that you should pray in a certain way, not eat something and the other religion may say you should not pray in that way and you should not eat something else. While we are allowed to believe in as many religions as we want to, and while we realize that all religions are good, we have to understand that religions only teach us the basics about God, they are like kindergartens. Therefore we have to evolve beyond kindergarten, we have to go to the university of Spirituality. No need of changing our religion, we must believe in the basics of our religion and then seek God, yearn for God. This yearning will take us in quest of God, and then we will realize God in the temple of our heart. That is the way forward in religion.