Whether you believe in God or not does not matter much, whether you believe in Buddha or not does not matter so much; as a Buddhist, whether you believe in reincarnation or not does not matter so much. You must lead a good life.
If there is love, there is hope that one may have real families, real brotherhood, real equanimity, real peace. If the love within your mind is lost and you see other beings as enemies, then no matter how much knowledge or education or material comfort you have, only suffering and confusion will ensue.
If we adopt a self-centered approach to life, by which we attempt to use others for our own self interest, we might be able to gain temporary benefits, but in the long run we will not succeed in achieving even our personal happiness, and hope for the next life is out of the question.
Happiness is a state of mind. With physical comforts if your mind is still in a state of confusion and agitation, it is not happiness. Happiness means calmness of mind.
Giving material goods is one form of generosity, but one can extend an attitude of generosity into all one's behavior. Being kind, attentive, and honest in dealing with others, offering praise where it is due, giving comfort and advice where they are needed, and simply sharing one's time with someone - all these are forms of generosity, and they do not require any particular level of material wealth.
The real troublemakers are anger, jealousy, impatience, and hatred. With them, problems cannot be solved. Though we may have temporary success, ultimately our hatred or anger will create futher difficulties. Anger makes for swift solutions. Yet, when we face problems with compassion, sincerity, and good motivation, our solutions may take longer, but ultimately they are better.