Bonhoffer said:
For a truly born-again Christian to convert to another religion would be like an 88 year old black man becoming a 10 year old Asian girl.
People who convert from Christianity cannot be Christians in the first place. Maybe they beleived in their head, but its the heart and soul that matters.
Don't go by this statement. This could lead you into a lot of heartach. You, and The Holy Spirit, alone know if you are saved, and I would tell you that you only have two choices of whom you will serve. It's God or satan, and any religion that doesn't confess Jesus as God is of satan, regardless of how much good they may speak and do. And I want to warn you that anyone who starts the salvation process can walk away from it by there own freewill choices, no one can take them away, God won't take them out of it, but they can.
Matt 6:24
24 No man can serve two masters: for either he will hate the one, and love the other; or else he will hold to the one, and despise the other. Ye cannot serve God and mammon.
Luke 16:13
13 No servant can serve two masters: for either he will hate the one, and love the other; or else he will hold to the one, and despise the other. Ye cannot serve God and mammon.
Prov 3:5-8 TRUST IN THE LORD WITH ALL THINE HEART, LEAN NOT TO YOUR OWN UNDERSTANDING, BE NOT WISE IN YOUR OWN EYES
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II Tim 3:16-17 ALL SCRIPTURE BY INSPIRATION OF GOD, AND PROFITABLE, THAT THE MAN OF GOD BE PERFECT
2 Pet 1:20 NO PROPHECY OF THE SCRIPTURE IS OF ANY PRIVATE INTERPRETATION
2 Sam 14:14 NEITHER DOTH GOD RESPECT ANY PERSON
Job 37:24 HE RESPECTETH NOT ANY THAT ARE WISE OF HEART.
John 17:22-23 BE ONE, EVEN AS WE ARE ONE, THAT THEY MAY BE MADE PERFECT IN ONE
James 1:22-25 BUT BE YE DOERS OF THE WORD, AND NO HEARERS ONLY
Josh 24:15
15 And if it seem evil unto you to serve the LORD, CHOOSE YOU THIS DAY whom ye will serve; whether the gods which your fathers served that were on the other side of the flood, or the gods of the Amorites, in whose land ye dwell: but as for me and my house, we will serve the LORD.
(KJV)
The Holy Spirit is the only one who can answer that question for you, cause He's the only one who knows The innermost thoughts, and imaginations of your heart, and mind.