Why 400 study year old doctrines while the Bible lives?

I'm not a Calvinist. I'm not reformed. Evangelism is the least of my concerns regarding the church today. And what ever was done in Calvin’s day has little impact on us except for the idolatry that seems to accompany some of his teachings.

You can take the message of Jesus to your next door neighbor. In fact if your next door neighbor does not know you to be a follower of Christ likely you are not following Christ.

God knows who are His. But I don't. Men are some what like angels in this regard. We don't know who it is who will wind up in heaven in every case.  This is all the more reason to make disciples of Christ and not of Calvin. Wherever Calvin is in heaven or in hell I know he will agree with that.

Calvinists have one particular defect in their doctrine that needs wholesale overhaul, and that is the future of Israel, the people and the land. I challenge anyone to show me where God has gone back on his covenant promise to Abraham, Isaac and Jacob and all the faithful of the children of Israel to keep them as a distinct people and finally return them to their promised land of Israel (Canaan). To do this as has been done is to twist a few scriptures against many, many others. But more to the point, for God to go back on a promise from His mouth is unthinkable. And the promise to Abraham is a unilateral promise. 

Jeremiah 31

 35 Thus saith the LORD, which giveth the sun for a light by day, and the ordinances of the moon and of the stars for a light by night, which divideth the sea when the waves thereof roar; The LORD of hosts is his name:

 36 If those ordinances depart from before me, saith the LORD, then the seed of Israel also shall cease from being a nation before me for ever.

 37 Thus saith the LORD; If heaven above can be measured, and the foundations of the earth searched out beneath, I will also cast off all the seed of Israel for all that they have done, saith the LORD.

Don't let yourself be fooled to think that the gentile church of today is the seed of Israel. It is not. All the descendants of Abraham through Isaac are the seed of Israel including the greatest seed the Messiah Yeshua (Christ Jesus).

John 4:22

 Ye worship ye know not what: we know what we worship: for salvation is of the Jews.

It is remarkable that so many do not know yet what they worship.