Jesus Christ is lord and saviour and we are saved by grace. This grace is available to all that are willing to believe in the only begotten son of the only living God.
But not all are willing.
Jesus Christ died for our sins on the cross and he was buried and on the third day he was resurrected and all those that believe on him receive the free gift of eternal life in heaven. Once saved always saved.
Because of this enourmous grace that God has extended to us we are to have our heart established with grace and not with diverse doctrine always be prepared to share the gospel.
We have no reason to be angry on unsaved people because they are worse off than we, since they are on their way to the lake of fire.
Rather we should make friends with mammon of unrightiousness so that they can receive us into everlasting habitations.
When a brother makes us stumble or teaches us heresy or lordship damnation we are to separate ourselves from that brother rather than start a strife.
The gospel of the grace of God that God gave his only begotten son so that all those that believe on him can receive the free gift of eternal life, is good news.
It is not foolishness to us but rather its the power of God unto salvation.