Here are my reasons:
When I read in Matthew-John Jesus saying "follow me" to his disciples, they left what they were doing (career, family, friends) immediately and literally followed him around.
“And they straightway left their nets, and followed him.” Matt 4:20
“And they immediately left the ship and their father, and followed him." Matt 4:22
“When he was come down from the mountain, great multitudes followed him.” Matt 8:1
When I look at what Jesus taught in Matthew through John, I find that it simply is not a practical teaching for my life. In Matt 6:25-34 Jesus teaches
"Therefore take no thought, saying, What shall we eat? or, What shall we drink? or, Wherewithal shall we be clothed? ...for your heavenly Father knoweth that ye have need of all these things."
You would be lying (which is a sin) if you said you did not think about these things. I take thought of these things a lot, therefore, I find that I cannot follow Jesus in this teaching. Besides, I do not have faith that Jesus will provide my food or clothing that I need for my life.
Common sense tells me that if I do not work, I will not eat (nor be able to buy my clothing) - actually the bible tells me that in 2 Thessalonians 3:10 and I find that it is true still today. THIS teaching is what I have faith in.
In Matthew 19:16-30 a man came to Jesus and asked
"Good Master, what good thing shall I do, that I may have eternal life?"
Jesus answered "keep the commandments...and go and sell all that thou hast and give to the poor"
Common sense tells me that if I sell all that I have and give to the poor, I then will become poor myself, thus being a burden or chargeable to those who I may wish to minister to, making them provide for my needs when in 2 Thessalonians 2:9 it is suggested that we labor (Paul being a tent maker - Acts 18:3) for our needs so that we may only be blamed of preaching the gospel to others.
Besides I do not have faith in Jesus' answer of getting eternal life by keeping the commandments, or living a good life, or not sinning. But I do have faith in Ephesians 2:8-9 "For by grace through faith are ye saved and that not of yourselves it is a gift of God not of works least any man should boast." I do have faith in Titus 3 which says "not by works of righteousness which we have done but according to his mercy he saved us."
Let me make myself clear, perhaps I should say that I have decided not to follow Jesus' earthly ministry given to Israel, under the law, at a time when Jesus was leading them to a kingdom where all of their needs would be provided for. So when I read Jesus telling Israel to sell all that they have and give to the poor (especially when their eternal life depended on how much they gave), to give no thought for the morrow (especially when their eternal life depended on their faith in God's provision) I can have confidence that my faith is not in what Jesus said to Israel in Matthew through John, Acts, and Hebrews through Revelation.
Rather, my faith is in what was revealed to the Apostle Paul, the mystery given to him (Eph 3, Rom 16:25, 1 Cor 11:1). I have decided NOT to follow Jesus in his earthly ministry in which he came concerning his own people, the nation Israel and the law, who are destined to an earthly kingdom. However, I HAVE decided to follow Jesus' heavenly ministry for the church today which is the Body of Christ which is destined for heavenly places. The two being much and very different.
Here are some resources on the differences between following Jesus' instructions given to Israel (which if I could take a guess you have been fooling yourself that they work for you, or have realized it doesn't really work but what else are you to believe) and following Jesus' instructions for the Church today as they are given to the Apostle Paul.
*I believe the entire bible. I believe it to be God's word. I believe that the entire bible is God inspired and that the entire bible is truth. As I read God's word, it teaches and shows me that there were two plans from the beginning and that it would be wrong to follow instructions that God intended for someone else at a different time.