The Bible is decidedly clear that there is only one way to spend eternity in Heaven with the Father. Jesus Christ came to Earth, was born of a virgin, lived a sinless life and died on a cross- but was resurrected. This sacrifice provided the only means by which men could be eternally restored into right- relationship with God. The first step to living an abundant life is to submit your whole self to the grace of Jesus Christ. He came and atoned for our sins- not so that we wouldn't have to, but because we couldn't. Jesus alone satisfied the justice of the Father, and in Jesus alone are we reconciled to the Father. 

Relationship with Jesus is easy. If you believe in your heart that He is the son of God and confess with your mouth that He is the perfect atonement for your sin, then you can have the promise that you are a child of God.