I like the Dalai Lama's answer to that question. Read his complete response in the following

Which Religion Is Best?
The Dalai Lama
"The best religion is the one that gets you closest to God. It's the one that make you a better person." Dalai Lama
What makes you better? "What ever makes you more compassionate, more sensible, more detached, more loving, more humanitarian, more responsible, more ethical." "The religion that will do that for you is the best religion." Dalai Lama
"I am not interested, my friend, about your religion or if you are religious or not." "What really is important to me is your behavior in front of your peers, family, work, community, and in front of the world." Remember, the Universe is the echo of our actions and our thoughts." Dalai Lama
"The action and reaction is not exclusively for physics. It is also of human relations. If I act with goodness, I will receive goodness. If i act with evil, I will get evil." "What our grandparents told us is the pure truth. You will always have what you desire for others. Being happy is not a destiny. It is ...a matter of options." Dalai lama
"Take care of your thoughts because the become words. Take care of your words because they will become actions. Take care of your actions because they will become habits. Take care of your habits because they will form your character. Take care of your character because it will form your destiny, and your destiny w...ill be your life and there is no religion higher than TRUTH." Dalai Lama