Christians, why am I must believe in Christ if I didn't saw any miracle for all my life?

How are you to be saved from your sin?

John 20:29 says: "Jesus said to him: “Because you have seen me, have you believed? Happy are those who have not seen and yet believe."

Read this article: https://www.jw.org/finder?wtlocale=E&docid=2005685&srcid=share

I saw "Miracles" after believing in Christ with all of my heart. 
In that time I really tried to follow Jesus. I loved him.
I have to recognize that i dont have such a faith anymore ( I don't know why ). 
I Still believe but i can't have such faith.
Maybe you have no faith or you didn't try to follow Jesus. 


John 14:21
He that hath my commandments, and keepeth them, he it is that loveth me: and he that loveth me shall be loved of my Father, and I will love him, and will manifest myself to him.

Matthew 21:21
Jesus answered and said unto them, Verily I say unto you, If ye have faith, and doubt not, ye shall not only do this which is done to the fig tree, but also if ye shall say unto this mountain, Be thou removed, and be thou cast into the sea; it shall be done.

Well...

obviously you DON'T HAVE to believe in Christ.

However
because we are all sinners (including you)
if you do NOT believe in and follow Christ
then your sins will not be forgiven
and if your sins are not forgiven
then on Judgment Day you will be consigned to Hell for your sins.

Now: I am definitely NOT attempting to scare you. You could only be scared if you already believed in those things...and I assume that you don't, or you wouldn't need it to be explained to you.

SO:
- if you don't believe in the Christian God
- or if you don't believe in Hell
- or if you don't believe that being a follower of Christ will save you from Hell
- then I cannot think of any reason why you should believe in Christ
- let alone a reason that you MUST believe in Christ

Since you're not dead yet, the question is completely hypothetical.  You're just going off of hearsay, and expecting it to "happen to you", without knowing what you're looking for.  Maybe you accept miracles as an "act of God", but how could you recognize one if you're unsure about what 'God' is?  If you ignore or deny the source of your existence, what makes you believe that you'll come to see a miracle.  

How can you recognize 'photosynthesis' without some fundamental understanding of what it is you're seeking out?  It's as if you're looking for some "trickery" to convince you, but are being selective about what tricks you'd accept.  The inability to recognize that your mere existence, and that you have the capacity to seek out the 'Source' of your existence, as a miracle, is just lost on you.

You cannot see the "dog in the clouds" if you only take them to be 'condensed water vapor'.

I've  seen miracles 

Jesus performed miracles mainly in order to fulfill Bible prophecy. Miracles may appear to be few and far between today, but they still occur at rates that have remained fairly consistent, over time. In biblical times frames, in regard to true prophets and their associated miracles, "spurts" of miracles tend to occur only every 300 to 500 years, or so. So perhaps, we're "due". Hang in there!

Paul was an apostle only in his own mind. He alone claims Jesus and God made him an apostle. Nowhere else in the Bible besides in his epistle, 2 Corinthians, does it say Timothy referred to him as an apostle. Peter refused to recognize him as an apostle.